diff --git a/src/App.vue b/src/App.vue
index b856c61..748d2cb 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -43,7 +43,7 @@
     <el-dialog
       v-model="positionOpen"
       title="机构持仓"
-      width="1100px"
+      width="70%"
       top="5vh"
       class="panel-dialog position-dialog"
       destroy-on-close
diff --git a/src/components/header/SettingsDialog.vue b/src/components/header/SettingsDialog.vue
index 5f3ef39..4fd1928 100644
--- a/src/components/header/SettingsDialog.vue
+++ b/src/components/header/SettingsDialog.vue
@@ -16,12 +16,12 @@
           autocomplete="off"
         />
       </el-form-item>
-      <el-form-item label="额外关键词">
+      <el-form-item label="额外关键字">
         <el-input
           v-model="localKeywords"
           type="textarea"
-          :rows="3"
-          placeholder="用于新闻过滤与分析增强，多个词用逗号或换行分隔"
+          :rows="4"
+          placeholder="用于规定 AI 角色与分析增强，多个词用逗号或换行分隔"
         />
       </el-form-item>
     </el-form>
@@ -35,7 +35,7 @@
 <script setup lang="ts">
 import { ref, watch } from 'vue'
 import { ElMessage } from 'element-plus'
-import { useSettingsStore } from '../../stores/settings'
+import { useSettingsStore, DEFAULT_KEYWORDS } from '../../stores/settings'
 
 const props = withDefaults(
   defineProps<{
@@ -56,15 +56,15 @@ watch(
   (open) => {
     if (open) {
       localKey.value = settings.apiKey
-      localKeywords.value = settings.keywords
+      localKeywords.value = settings.keywords || DEFAULT_KEYWORDS
     }
   },
 )
 
 function save() {
   settings.apiKey = localKey.value.trim()
-  settings.keywords = localKeywords.value.trim()
+  settings.keywords = localKeywords.value.trim() || DEFAULT_KEYWORDS
   ElMessage.success('设置已保存到本地')
   emit('update:modelValue', false)
 }
-</script>
+</script>
\ No newline at end of file
diff --git a/src/stores/settings.ts b/src/stores/settings.ts
index a5bb3a6..6863ff3 100644
--- a/src/stores/settings.ts
+++ b/src/stores/settings.ts
@@ -4,6 +4,10 @@ import type { AppSettings } from '../types'
 
 const STORAGE_KEY = 'ai-trade-settings'
 
+/** 额外关键字默认：规定 AI 角色与分析能力 */
+export const DEFAULT_KEYWORDS =
+  '你是一名专业的国内期货交易员和分析员，精通机构操盘手法，能够根据持仓与交易数据分析当前走势。'
+
 function load(): Partial<AppSettings> {
   try {
     return JSON.parse(localStorage.getItem(STORAGE_KEY) || '{}') as Partial<AppSettings>
@@ -15,7 +19,7 @@ function load(): Partial<AppSettings> {
 export const useSettingsStore = defineStore('settings', () => {
   const saved = load()
   const apiKey = ref(saved.apiKey || '')
-  const keywords = ref(saved.keywords || '')
+  const keywords = ref(saved.keywords || DEFAULT_KEYWORDS)
 
   watch([apiKey, keywords], () => {
     const payload: AppSettings = {
@@ -23,7 +27,7 @@ export const useSettingsStore = defineStore('settings', () => {
       keywords: keywords.value,
     }
     localStorage.setItem(STORAGE_KEY, JSON.stringify(payload))
-  })
+  }, { immediate: true })
 
   return { apiKey, keywords }
 })