diff --git a/src/App.vue b/src/App.vue
index 748d2cb..6685f49 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -43,7 +43,7 @@
     <el-dialog
       v-model="positionOpen"
       title="机构持仓"
-      width="70%"
+      width="80%"
       top="5vh"
       class="panel-dialog position-dialog"
       destroy-on-close
diff --git a/src/api/jqka/mapPosition.ts b/src/api/jqka/mapPosition.ts
index 6925946..f09b591 100644
--- a/src/api/jqka/mapPosition.ts
+++ b/src/api/jqka/mapPosition.ts
@@ -1,10 +1,14 @@
 import type { PositionRow, PositionsData, ProfitRow, TopTwentySum } from '../../types'
+import { getRecentMonthsRange } from '../../utils/tradingDate'
 import type {
   JqkaDealPositionData,
   JqkaPositionItem,
   JqkaPositionProfitData,
 } from './types'
 
+/** 前 20 多空总持仓图表仅保留最近 3 个月 */
+const TOP_TWENTY_SUM_MONTHS = 3
+
 const TOP_N = 20
 
 function withPercent(list: PositionRow[], totalHint?: number): PositionRow[] {
@@ -78,13 +82,14 @@ export function mapJqkaDealPosition(data: JqkaDealPositionData): PositionsData {
     }),
   )
 
-  const topTwentySum: TopTwentySum[] = (data.topTwentyPositionSum ?? []).map(
-    (s) => ({
+  const { startDate } = getRecentMonthsRange(TOP_TWENTY_SUM_MONTHS)
+  const topTwentySum: TopTwentySum[] = (data.topTwentyPositionSum ?? [])
+    .filter((s) => s.tradeDate >= startDate)
+    .map((s) => ({
       tradeDate: s.tradeDate,
       longSum: s.f009nSum,
       shortSum: s.f015nSum,
-    }),
-  )
+    }))
 
   const updatedAt =
     list[0]?.tradeDate || sumLatest?.tradeDate || new Date().toISOString().slice(0, 10)
diff --git a/src/components/position/PositionSumBar.vue b/src/components/position/PositionSumBar.vue
index d6d954e..8117117 100644
--- a/src/components/position/PositionSumBar.vue
+++ b/src/components/position/PositionSumBar.vue
@@ -18,18 +18,23 @@ import {
 import type { EChartsOption } from 'echarts'
 import VChart from 'vue-echarts'
 import type { TopTwentySum } from '../../types'
+import { getRecentMonthsRange } from '../../utils/tradingDate'
 
 use([CanvasRenderer, BarChart, GridComponent, TooltipComponent, LegendComponent])
 
+/** 仅展示最近 3 个月 */
+const DISPLAY_MONTHS = 3
+
 const props = defineProps<{
   list: TopTwentySum[]
 }>()
 
 const option = computed((): EChartsOption => {
-  // 接口通常新→旧，图表按时间从左到右
-  const sorted = [...props.list].sort((a, b) =>
-    a.tradeDate.localeCompare(b.tradeDate),
-  )
+  const { startDate } = getRecentMonthsRange(DISPLAY_MONTHS)
+  // 接口通常新→旧，图表按时间从左到右；仅保留最近 3 个月
+  const sorted = [...props.list]
+    .filter((x) => x.tradeDate >= startDate)
+    .sort((a, b) => a.tradeDate.localeCompare(b.tradeDate))
   const dates = sorted.map((x) => x.tradeDate)
   const longData = sorted.map((x) => x.longSum)
   const shortData = sorted.map((x) => x.shortSum)
diff --git a/src/utils/tradingDate.ts b/src/utils/tradingDate.ts
index 5c7a6dc..6e6cc53 100644
--- a/src/utils/tradingDate.ts
+++ b/src/utils/tradingDate.ts
@@ -51,6 +51,25 @@ export function extractVariety(contract: string): string {
   return m ? m[1] : contract
 }
 
+/**
+ * 最近 N 个月日期区间（含起止日）。
+ */
+export function getRecentMonthsRange(
+  months: number,
+  from: Date = new Date(),
+): {
+  startDate: string
+  endDate: string
+} {
+  const end = new Date(from.getFullYear(), from.getMonth(), from.getDate())
+  const start = new Date(end)
+  start.setMonth(start.getMonth() - months)
+  return {
+    startDate: formatDateYmd(start),
+    endDate: formatDateYmd(end),
+  }
+}
+
 /**
  * 最近一个月日期区间（含起止日），用于机构盈利等按区间查询的接口。
  */
@@ -58,11 +77,5 @@ export function getRecentMonthRange(from: Date = new Date()): {
   startDate: string
   endDate: string
 } {
-  const end = new Date(from.getFullYear(), from.getMonth(), from.getDate())
-  const start = new Date(end)
-  start.setMonth(start.getMonth() - 1)
-  return {
-    startDate: formatDateYmd(start),
-    endDate: formatDateYmd(end),
-  }
+  return getRecentMonthsRange(1, from)
 }