diff --git a/admin.html b/admin.html
index 0551e02..5c803c8 100644
--- a/admin.html
+++ b/admin.html
@@ -123,16 +123,27 @@
         </el-card>
         </el-tab-pane>
 
-        <el-tab-pane label="Mock 数据配置" name="mocks">
+        <el-tab-pane label="数据配置" name="mocks">
         <el-card class="section-card">
         <div style="display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;">
-          <strong>Mock 数据配置</strong>
+          <strong>数据配置（mock）</strong>
           <div style="display:flex;gap:8px;align-items:center;">
+            <el-select size="small" v-model="mockGroupFilter" clearable placeholder="按分组筛选" style="width:160px;">
+              <el-option label="全部" :value="null"></el-option>
+              <el-option label="未分组" :value="-1"></el-option>
+              <el-option v-for="g in mockGroups" :key="g.id" :label="g.name" :value="g.id"></el-option>
+            </el-select>
             <el-input size="small" v-model="mockFileSearch" placeholder="搜索别名或路径" clearable style="width:220px;" prefix-icon="el-icon-search"></el-input>
             <el-button size="mini" type="primary" @click="openMockFileDialogForCreate">新增 Mock 文件</el-button>
+            <el-button size="mini" @click="openMockGroupDialog">分组管理</el-button>
           </div>
         </div>
         <el-table :data="pagedMockFiles" border>
+          <el-table-column label="分组" width="140">
+            <template slot-scope="scope">
+              <span>{{ getGroupName(scope.row.groupId) }}</span>
+            </template>
+          </el-table-column>
           <el-table-column label="别名" min-width="180">
             <template slot-scope="scope">
               <span>{{ scope.row.alias || "-" }}</span>
@@ -313,19 +324,37 @@
             ></el-input>
           </el-form-item>
           <el-form-item label="Mock 文件">
-            <el-select
-              v-model="routeDialog.form.filePath"
-              filterable
-              placeholder="请选择 mock 文件"
-              style="width: 100%;"
-            >
-              <el-option
-                v-for="item in mockFiles"
-                :key="item.filePath"
-                :label="item.alias ? item.alias + ' (' + item.filePath + ')' : item.filePath"
-                :value="item.filePath"
-              ></el-option>
-            </el-select>
+            <div style="display:flex;gap:8px;">
+              <el-select
+                v-model="routeDialog.form.groupFilter"
+                clearable
+                placeholder="选择分组"
+                style="width: 180px;"
+                @change="onRouteDialogGroupChange"
+              >
+                <el-option label="全部" :value="null"></el-option>
+                <el-option label="无分组" :value="-1"></el-option>
+                <el-option
+                  v-for="g in mockGroups"
+                  :key="g.id"
+                  :label="g.name"
+                  :value="g.id"
+                ></el-option>
+              </el-select>
+              <el-select
+                v-model="routeDialog.form.filePath"
+                filterable
+                placeholder="请选择 mock 文件"
+                style="flex: 1;"
+              >
+                <el-option
+                  v-for="item in routeDialogMockFiles"
+                  :key="item.filePath"
+                  :label="item.alias ? item.alias + ' (' + item.filePath + ')' : item.filePath"
+                  :value="item.filePath"
+                ></el-option>
+              </el-select>
+            </div>
           </el-form-item>
           <el-form-item label="返回状态码">
             <el-select
@@ -369,6 +398,12 @@
               placeholder="可选：用于展示，支持任意文本"
             ></el-input>
           </el-form-item>
+          <el-form-item label="分组">
+            <el-select v-model="mockFileDialog.form.groupId" clearable placeholder="选择分组" style="width: 100%;">
+              <el-option label="无分组" :value="null"></el-option>
+              <el-option v-for="g in mockGroups" :key="g.id" :label="g.name" :value="g.id"></el-option>
+            </el-select>
+          </el-form-item>
           <el-form-item label="Mock 文件路径">
             <el-input
               v-model="mockFileDialog.form.fileName"
@@ -435,6 +470,67 @@
           <el-button type="primary" @click="submitBatchImport">导入</el-button>
         </span>
       </el-dialog>
+
+      <el-dialog
+        title="分组管理"
+        :visible.sync="mockGroupDialog.visible"
+        width="600px"
+      >
+        <div style="margin-bottom:12px;">
+          <el-button size="mini" type="primary" @click="addMockGroup">新增分组</el-button>
+        </div>
+        <el-table :data="mockGroups" border size="small" style="width: 100%;">
+          <el-table-column prop="id" label="ID" width="60"></el-table-column>
+          <el-table-column label="分组名称" min-width="200">
+            <template slot-scope="scope">
+              <el-input
+                v-if="mockGroupDialog.editingId === scope.row.id"
+                v-model="mockGroupDialog.form.name"
+                size="small"
+                @blur="saveMockGroupEdit(scope.row)"
+                @keyup.enter.native="saveMockGroupEdit(scope.row)"
+              ></el-input>
+              <span v-else>{{ scope.row.name }}</span>
+            </template>
+          </el-table-column>
+          <el-table-column label="文件数" width="80" align="center">
+            <template slot-scope="scope">
+              <span>{{ getGroupFileCount(scope.row.id) }}</span>
+            </template>
+          </el-table-column>
+          <el-table-column label="操作" width="160">
+            <template slot-scope="scope">
+              <el-button size="mini" type="primary" plain @click="startEditMockGroup(scope.row)">修改</el-button>
+              <el-button size="mini" type="danger" @click="confirmDeleteGroup(scope.row)">删除</el-button>
+            </template>
+          </el-table-column>
+        </el-table>
+      </el-dialog>
+
+      <el-dialog
+        title="删除分组确认"
+        :visible.sync="deleteGroupDialog.visible"
+        width="500px"
+      >
+        <div style="margin-bottom:16px;">
+          <p>分组「{{ deleteGroupDialog.groupName }}」下有 <strong>{{ deleteGroupDialog.fileCount }}</strong> 个 mock 文件。</p>
+          <p>请选择对这些文件的处理方式：</p>
+        </div>
+        <el-radio-group v-model="deleteGroupDialog.action" style="display:flex;flex-direction:column;gap:12px;">
+          <el-radio label="reassign">转移到其他分组</el-radio>
+          <el-radio label="unassign">取消分组（设为未分组）</el-radio>
+          <el-radio label="delete">删除全部文件</el-radio>
+        </el-radio-group>
+        <div v-if="deleteGroupDialog.action === 'reassign'" style="margin-top:12px;">
+          <el-select v-model="deleteGroupDialog.targetGroupId" placeholder="选择目标分组" style="width:100%;">
+            <el-option v-for="g in mockGroups.filter(function(g){return g.id !== deleteGroupDialog.groupId})" :key="g.id" :label="g.name" :value="g.id"></el-option>
+          </el-select>
+        </div>
+        <span slot="footer" class="dialog-footer">
+          <el-button @click="deleteGroupDialog.visible = false">取消</el-button>
+          <el-button type="danger" @click="submitDeleteGroup">确认删除</el-button>
+        </span>
+      </el-dialog>
       </div>
     </div>
 
@@ -459,6 +555,22 @@
               input: "",
             },
             mockFiles: [],
+            mockGroups: [],
+            mockGroupFilter: null,
+            mockGroupDialog: {
+              visible: false,
+              mode: "create",
+              editingId: null,
+              form: { name: "" },
+            },
+            deleteGroupDialog: {
+              visible: false,
+              groupId: null,
+              groupName: "",
+              fileCount: 0,
+              action: "",
+              targetGroupId: null,
+            },
             contentTypeOptions: [
               "application/json",
               "application/x-www-form-urlencoded",
@@ -515,6 +627,7 @@
                 filePath: "",
                 statusCode: 200,
                 enabled: true,
+                groupFilter: null,
               },
             },
             mockFileDialog: {
@@ -531,11 +644,13 @@
         watch: {
           routeSearch: function () { this.routePagination.currentPage = 1; },
           mockFileSearch: function () { this.mockFilePagination.currentPage = 1; },
+          mockGroupFilter: function () { this.mockFilePagination.currentPage = 1; },
           apiSearch: function () { this.apiPagination.currentPage = 1; },
         },
         created: async function () {
           await this.loadApiList();
           await this.loadMockFiles();
+          await this.loadMockGroups();
           await this.loadConfig();
         },
         methods: {
@@ -648,6 +763,7 @@
               filePath: "",
               statusCode: 200,
               enabled: true,
+              groupFilter: null,
             };
           },
           isApiListLocked: function () {
@@ -663,6 +779,10 @@
             this.routeDialog.form.route = selected.route;
             this.routeDialog.form.apiName = selected.name;
           },
+          onRouteDialogGroupChange: function () {
+            // 切换分组时清空已选文件
+            this.routeDialog.form.filePath = "";
+          },
           openRouteDialogForCreate: function () {
             this.routeDialog.mode = "create";
             this.routeDialog.editingIndex = -1;
@@ -678,6 +798,8 @@
             this.routeDialog.mode = "edit";
             this.routeDialog.editingIndex = actualIndex;
             var matched = this.findApiByRoute(item.route || "");
+            var mockFile = this.mockFiles.find(function (f) { return f.filePath === item.filePath; });
+            var groupFilter = mockFile && mockFile.groupId ? mockFile.groupId : null;
             this.routeDialog.form = {
               apiName: matched ? matched.name : item.apiName || "",
               selectedApiRoute: matched ? matched.route : "",
@@ -686,6 +808,7 @@
               filePath: item.filePath || "mock/",
               statusCode: this.normalizeStatusCode(item.statusCode),
               enabled: item.enabled !== false,
+              groupFilter: groupFilter,
             };
             this.routeDialog.visible = true;
           },
@@ -694,6 +817,7 @@
               fileName: "",
               alias: "",
               content: "",
+              groupId: null,
             };
           },
           openMockFileDialogForCreate: function () {
@@ -709,6 +833,7 @@
               fileName: name,
               alias: String(item.alias || ""),
               content: String(item.content || ""),
+              groupId: item.groupId || null,
             };
             this.mockFileDialog.visible = true;
           },
@@ -745,6 +870,7 @@
                   filePath: filePath,
                   alias: this.mockFileDialog.form.alias,
                   content: this.mockFileDialog.form.content,
+                  groupId: this.mockFileDialog.form.groupId,
                 }),
               });
               var data = await resp.json();
@@ -1010,6 +1136,148 @@
             this.batchImportDialog.visible = false;
             await this.loadApiList();
           },
+          getGroupName: function (groupId) {
+            if (!groupId) return "未分组";
+            var group = this.mockGroups.find(function (g) { return g.id === groupId; });
+            return group ? group.name : "未分组";
+          },
+          getGroupFileCount: function (groupId) {
+            return this.mockFiles.filter(function (f) { return f.groupId === groupId; }).length;
+          },
+          loadMockGroups: async function () {
+            try {
+              var resp = await fetch("/__mock-groups");
+              var data = await resp.json();
+              if (!resp.ok || data.success === false) {
+                throw new Error(data.error || "加载分组失败");
+              }
+              this.mockGroups = Array.isArray(data.list) ? data.list : [];
+            } catch (err) {
+              this.mockGroups = [];
+              this.$message.error("加载分组失败: " + err.message);
+            }
+          },
+          openMockGroupDialog: function () {
+            this.mockGroupDialog.editingId = null;
+            this.mockGroupDialog.form.name = "";
+            this.mockGroupDialog.visible = true;
+          },
+          addMockGroup: async function () {
+            var self = this;
+            this.$prompt("请输入分组名称", "新增分组", {
+              confirmButtonText: "确定",
+              cancelButtonText: "取消",
+              inputPattern: /\S+/,
+              inputErrorMessage: "分组名称不能为空",
+            }).then(async function (res) {
+              var name = (res.value || "").trim();
+              try {
+                var resp = await fetch("/__mock-groups", {
+                  method: "POST",
+                  headers: { "Content-Type": "application/json" },
+                  body: JSON.stringify({ name: name }),
+                });
+                var data = await resp.json();
+                if (!resp.ok || data.success === false) {
+                  throw new Error(data.error || "新增分组失败");
+                }
+                self.$message.success("分组已创建");
+                await self.loadMockGroups();
+              } catch (err) {
+                self.$message.error("新增分组失败: " + err.message);
+              }
+            }).catch(function () {});
+          },
+          startEditMockGroup: function (group) {
+            this.mockGroupDialog.editingId = group.id;
+            this.mockGroupDialog.form.name = group.name;
+          },
+          saveMockGroupEdit: async function (group) {
+            var newName = (this.mockGroupDialog.form.name || "").trim();
+            this.mockGroupDialog.editingId = null;
+            if (!newName || newName === group.name) return;
+            try {
+              var resp = await fetch("/__mock-groups", {
+                method: "PUT",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify({ id: group.id, name: newName }),
+              });
+              var data = await resp.json();
+              if (!resp.ok || data.success === false) {
+                throw new Error(data.error || "修改分组失败");
+              }
+              this.$message.success("分组已修改");
+              await this.loadMockGroups();
+            } catch (err) {
+              this.$message.error("修改分组失败: " + err.message);
+            }
+          },
+          confirmDeleteGroup: async function (group) {
+            var fileCount = this.getGroupFileCount(group.id);
+            if (fileCount === 0) {
+              // 无文件，直接删除
+              try {
+                var resp = await fetch("/__mock-groups", {
+                  method: "DELETE",
+                  headers: { "Content-Type": "application/json" },
+                  body: JSON.stringify({ id: group.id }),
+                });
+                var data = await resp.json();
+                if (!resp.ok || data.success === false) {
+                  throw new Error(data.error || "删除分组失败");
+                }
+                this.$message.success("分组已删除");
+                await this.loadMockGroups();
+              } catch (err) {
+                this.$message.error("删除分组失败: " + err.message);
+              }
+              return;
+            }
+            // 有文件，弹出确认对话框
+            this.deleteGroupDialog.groupId = group.id;
+            this.deleteGroupDialog.groupName = group.name;
+            this.deleteGroupDialog.fileCount = fileCount;
+            this.deleteGroupDialog.action = "";
+            this.deleteGroupDialog.targetGroupId = null;
+            this.deleteGroupDialog.visible = true;
+          },
+          submitDeleteGroup: async function () {
+            var action = this.deleteGroupDialog.action;
+            if (!action) {
+              this.$message.error("请选择处理方式");
+              return;
+            }
+            if (action === "reassign" && !this.deleteGroupDialog.targetGroupId) {
+              this.$message.error("请选择目标分组");
+              return;
+            }
+            var payload = {
+              id: this.deleteGroupDialog.groupId,
+              action: action === "unassign" ? "reassign" : action,
+            };
+            if (action === "reassign") {
+              payload.targetGroupId = this.deleteGroupDialog.targetGroupId;
+            } else if (action === "unassign") {
+              payload.targetGroupId = null;
+            }
+            try {
+              var resp = await fetch("/__mock-groups", {
+                method: "DELETE",
+                headers: { "Content-Type": "application/json" },
+                body: JSON.stringify(payload),
+              });
+              var data = await resp.json();
+              if (!resp.ok || data.success === false) {
+                throw new Error(data.error || "删除分组失败");
+              }
+              this.$message.success("分组已删除");
+              this.deleteGroupDialog.visible = false;
+              await this.loadMockGroups();
+              await this.loadMockFiles();
+            } catch (err) {
+              this.$message.error("删除分组失败: " + err.message);
+            }
+          },
         },
         computed: {
           filteredRoutes: function () {
@@ -1030,13 +1298,24 @@
           },
           filteredMockFiles: function () {
             var q = (this.mockFileSearch || "").toLowerCase().trim();
-            if (!q) return this.mockFiles;
-            return this.mockFiles.filter(function (item) {
-              return (
-                (item.filePath || "").toLowerCase().indexOf(q) !== -1 ||
-                (item.alias || "").toLowerCase().indexOf(q) !== -1
-              );
-            });
+            var groupFilter = this.mockGroupFilter;
+            var list = this.mockFiles;
+            if (groupFilter !== null && groupFilter !== undefined) {
+              if (groupFilter === -1) {
+                list = list.filter(function (item) { return !item.groupId; });
+              } else {
+                list = list.filter(function (item) { return item.groupId === groupFilter; });
+              }
+            }
+            if (q) {
+              list = list.filter(function (item) {
+                return (
+                  (item.filePath || "").toLowerCase().indexOf(q) !== -1 ||
+                  (item.alias || "").toLowerCase().indexOf(q) !== -1
+                );
+              });
+            }
+            return list;
           },
           filteredApiList: function () {
             var q = (this.apiSearch || "").toLowerCase().trim();
@@ -1057,6 +1336,16 @@
           pagedApiList: function () {
             return this.getPagedData(this.filteredApiList, this.apiPagination);
           },
+          routeDialogMockFiles: function () {
+            var groupFilter = this.routeDialog.form.groupFilter;
+            if (groupFilter === null || groupFilter === undefined) {
+              return this.mockFiles;
+            }
+            if (groupFilter === -1) {
+              return this.mockFiles.filter(function (f) { return !f.groupId; });
+            }
+            return this.mockFiles.filter(function (f) { return f.groupId === groupFilter; });
+          },
         },
       });
     </script>
diff --git a/src/admin-handlers.ts b/src/admin-handlers.ts
index c303651..c7e717e 100644
--- a/src/admin-handlers.ts
+++ b/src/admin-handlers.ts
@@ -9,6 +9,13 @@ import {
   insertApiItemToDb,
   updateApiItemInDb,
   deleteApiItemFromDb,
+  loadMockGroups,
+  insertMockGroup,
+  updateMockGroup,
+  deleteMockGroup,
+  countMockFilesByGroup,
+  updateMockFilesGroupId,
+  deleteMockFilesByGroup,
 } from "./db";
 import {
   loadMockFiles,
@@ -393,9 +400,10 @@ async function handleMockFiles(
 
       if (clientReq.method === "POST") {
         const content = String(body.content || "");
+        const groupId = body.groupId != null ? Number(body.groupId) : null;
         fs.mkdirSync(path.dirname(fullPath), { recursive: true });
         fs.writeFileSync(fullPath, content, "utf-8");
-        await upsertMockFilePathToDb(normalizedPath, alias);
+        await upsertMockFilePathToDb(normalizedPath, alias, groupId);
         clientRes.writeHead(200, { "Content-Type": "application/json" });
         clientRes.end(
           JSON.stringify({
@@ -432,6 +440,113 @@ async function handleMockFiles(
     });
 }
 
+async function handleMockGroups(
+  clientReq: http.IncomingMessage,
+  clientRes: http.ServerResponse,
+): Promise<void> {
+  if (
+    clientReq.method !== "GET" &&
+    clientReq.method !== "POST" &&
+    clientReq.method !== "PUT" &&
+    clientReq.method !== "DELETE"
+  ) {
+    clientRes.writeHead(405, {
+      "Content-Type": "application/json",
+      Allow: "GET, POST, PUT, DELETE",
+    });
+    clientRes.end(
+      JSON.stringify({
+        success: false,
+        error: "Method Not Allowed",
+        allow: ["GET, POST, PUT, DELETE"],
+      }),
+    );
+    return;
+  }
+
+  if (clientReq.method === "GET") {
+    const list = await loadMockGroups();
+    clientRes.writeHead(200, { "Content-Type": "application/json" });
+    clientRes.end(JSON.stringify({ success: true, list }));
+    return;
+  }
+
+  readBody(clientReq)
+    .then(async (bodyText) => {
+      const body = bodyText ? JSON.parse(bodyText) : {};
+
+      if (clientReq.method === "POST") {
+        const name = String(body.name || "").trim();
+        if (!name) {
+          throw new Error("分组名称不能为空");
+        }
+        const id = await insertMockGroup(name);
+        clientRes.writeHead(200, { "Content-Type": "application/json" });
+        clientRes.end(JSON.stringify({ success: true, id, name }));
+        return;
+      }
+
+      if (clientReq.method === "PUT") {
+        const id = Number(body.id);
+        const name = String(body.name || "").trim();
+        if (!id || !name) {
+          throw new Error("id 和 name 不能为空");
+        }
+        await updateMockGroup(id, name);
+        clientRes.writeHead(200, { "Content-Type": "application/json" });
+        clientRes.end(JSON.stringify({ success: true, id, name }));
+        return;
+      }
+
+      // DELETE
+      const id = Number(body.id);
+      if (!id) {
+        throw new Error("id 不能为空");
+      }
+      const fileCount = await countMockFilesByGroup(id);
+      const action = String(body.action || "").trim();
+
+      if (fileCount > 0 && action === "reassign") {
+        const targetGroupId = body.targetGroupId != null ? Number(body.targetGroupId) : null;
+        await updateMockFilesGroupId(id, targetGroupId);
+      } else if (fileCount > 0 && action === "delete") {
+        const deletedFiles = await deleteMockFilesByGroup(id);
+        // 删除磁盘上的文件
+        for (const file of deletedFiles) {
+          const fullPath = path.join(__dirname, "..", file.file_path);
+          if (fs.existsSync(fullPath)) {
+            fs.unlinkSync(fullPath);
+          }
+        }
+      } else if (fileCount > 0) {
+        // 有文件但未指定 action，返回需要确认的信息
+        clientRes.writeHead(200, { "Content-Type": "application/json" });
+        clientRes.end(
+          JSON.stringify({
+            success: false,
+            needConfirm: true,
+            fileCount,
+            message: `该分组下有 ${fileCount} 个 mock 文件，请指定操作`,
+          }),
+        );
+        return;
+      }
+
+      await deleteMockGroup(id);
+      clientRes.writeHead(200, { "Content-Type": "application/json" });
+      clientRes.end(JSON.stringify({ success: true, id }));
+    })
+    .catch((error) => {
+      clientRes.writeHead(400, { "Content-Type": "application/json" });
+      clientRes.end(
+        JSON.stringify({
+          success: false,
+          error: (error as Error).message,
+        }),
+      );
+    });
+}
+
 async function handleAdminPage(
   clientReq: http.IncomingMessage,
   clientRes: http.ServerResponse,
@@ -476,6 +591,9 @@ export async function dispatchAdmin(
     case "/__mock-files":
       await handleMockFiles(clientReq, clientRes);
       return true;
+    case "/__mock-groups":
+      await handleMockGroups(clientReq, clientRes);
+      return true;
     case "/__admin":
       await handleAdminPage(clientReq, clientRes);
       return true;
diff --git a/src/db.ts b/src/db.ts
index 5ca289f..74d44e2 100644
--- a/src/db.ts
+++ b/src/db.ts
@@ -7,6 +7,7 @@ import type {
   ApiListItem,
   AppConfig,
   MockFileRow,
+  MockGroupRow,
   RouteApiNameMap,
   RouteConfig,
   RouteEnabledMap,
@@ -100,6 +101,12 @@ export async function initDatabase(): Promise<void> {
       name TEXT NOT NULL
     )
   `);
+  await dbRun(`
+    CREATE TABLE IF NOT EXISTS mock_groups (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      name TEXT NOT NULL UNIQUE
+    )
+  `);
   await dbRun(`
     CREATE TABLE IF NOT EXISTS mock_files (
       file_path TEXT PRIMARY KEY,
@@ -111,6 +118,11 @@ export async function initDatabase(): Promise<void> {
   ).catch(() => {
     // ignore when column already exists
   });
+  await dbRun(
+    "ALTER TABLE mock_files ADD COLUMN group_id INTEGER",
+  ).catch(() => {
+    // ignore when column already exists
+  });
   await dbRun(`
     CREATE TABLE IF NOT EXISTS server_config (
       key TEXT PRIMARY KEY,
@@ -211,8 +223,16 @@ export async function deleteApiItemFromDb(route: string): Promise<void> {
 export async function upsertMockFilePathToDb(
   filePath: string,
   alias?: string,
+  groupId?: number | null,
 ): Promise<void> {
   if (typeof alias === "string") {
+    if (typeof groupId !== "undefined") {
+      await dbRun(
+        "INSERT INTO mock_files(file_path, alias, group_id) VALUES(?, ?, ?) ON CONFLICT(file_path) DO UPDATE SET alias = excluded.alias, group_id = excluded.group_id",
+        [filePath, alias, groupId ?? null],
+      );
+      return;
+    }
     await dbRun(
       "INSERT INTO mock_files(file_path, alias) VALUES(?, ?) ON CONFLICT(file_path) DO UPDATE SET alias = excluded.alias",
       [filePath, alias],
@@ -230,14 +250,75 @@ export async function removeMockFilePathFromDb(filePath: string): Promise<void>
 
 export async function loadMockFilePathsFromDb(): Promise<MockFileRow[]> {
   const rows = await dbAll<MockFileRow>(
-    "SELECT file_path, alias FROM mock_files ORDER BY file_path ASC",
+    "SELECT file_path, alias, group_id FROM mock_files ORDER BY file_path ASC",
   );
   return rows.map((row) => ({
     file_path: row.file_path,
     alias: String(row.alias || ""),
+    group_id: row.group_id ?? null,
   }));
 }
 
+// ── mock_groups CRUD ──
+
+export async function loadMockGroups(): Promise<MockGroupRow[]> {
+  const rows = await dbAll<MockGroupRow>(
+    "SELECT id, name FROM mock_groups ORDER BY id ASC",
+  );
+  return rows.map((row) => ({ id: row.id, name: row.name }));
+}
+
+export async function insertMockGroup(name: string): Promise<number> {
+  await dbRun("INSERT INTO mock_groups(name) VALUES(?)", [name]);
+  const row = await dbAll<{ id: number }>(
+    "SELECT id FROM mock_groups WHERE name = ?",
+    [name],
+  );
+  return row[0]?.id ?? 0;
+}
+
+export async function updateMockGroup(
+  id: number,
+  name: string,
+): Promise<void> {
+  await dbRun("UPDATE mock_groups SET name = ? WHERE id = ?", [name, id]);
+}
+
+export async function deleteMockGroup(id: number): Promise<void> {
+  await dbRun("DELETE FROM mock_groups WHERE id = ?", [id]);
+}
+
+export async function countMockFilesByGroup(
+  groupId: number,
+): Promise<number> {
+  const rows = await dbAll<{ cnt: number }>(
+    "SELECT COUNT(*) AS cnt FROM mock_files WHERE group_id = ?",
+    [groupId],
+  );
+  return rows[0]?.cnt ?? 0;
+}
+
+export async function updateMockFilesGroupId(
+  oldGroupId: number,
+  newGroupId: number | null,
+): Promise<void> {
+  await dbRun("UPDATE mock_files SET group_id = ? WHERE group_id = ?", [
+    newGroupId,
+    oldGroupId,
+  ]);
+}
+
+export async function deleteMockFilesByGroup(
+  groupId: number,
+): Promise<MockFileRow[]> {
+  const rows = await dbAll<MockFileRow>(
+    "SELECT file_path FROM mock_files WHERE group_id = ?",
+    [groupId],
+  );
+  await dbRun("DELETE FROM mock_files WHERE group_id = ?", [groupId]);
+  return rows.map((row) => ({ file_path: row.file_path, alias: "", group_id: null }));
+}
+
 const DEFAULT_SERVER_CONFIG: AppConfig = {
   cacheConfig: true,
   reloadOnChange: true,
diff --git a/src/mock-files.ts b/src/mock-files.ts
index 361cecf..2749c82 100644
--- a/src/mock-files.ts
+++ b/src/mock-files.ts
@@ -63,7 +63,7 @@ export async function loadMockFiles(): Promise<MockFileItem[]> {
     for (const filePath of fsFiles) {
       await upsertMockFilePathToDb(filePath);
     }
-    files = fsFiles.map((filePath) => ({ file_path: filePath, alias: "" }));
+    files = fsFiles.map((filePath) => ({ file_path: filePath, alias: "", group_id: null }));
   }
 
   const result: MockFileItem[] = [];
@@ -75,6 +75,7 @@ export async function loadMockFiles(): Promise<MockFileItem[]> {
       filePath,
       alias: String(item.alias || ""),
       content: fs.readFileSync(fullPath, "utf-8"),
+      groupId: item.group_id ?? null,
     });
   }
   return result;
diff --git a/src/types.ts b/src/types.ts
index 45de4e2..b136eb2 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -35,6 +35,7 @@ export interface MockFileItem {
   filePath: string;
   alias: string;
   content: string;
+  groupId: number | null;
 }
 
 export interface RouteRow {
@@ -53,7 +54,13 @@ export interface RouteApiNameMap {
   [route: string]: string;
 }
 
+export interface MockGroupRow {
+  id: number;
+  name: string;
+}
+
 export interface MockFileRow {
   file_path: string;
   alias: string;
+  group_id: number | null;
 }