diff --git a/clinical-web/src/views/reports/use-report-dataset.ts b/clinical-web/src/views/reports/use-report-dataset.ts
index b00f3c8..789129d 100644
--- a/clinical-web/src/views/reports/use-report-dataset.ts
+++ b/clinical-web/src/views/reports/use-report-dataset.ts
@@ -1,4 +1,4 @@
-import { computed, ref, watch } from 'vue'
+import { computed, effectScope, ref, watch } from 'vue'
 
 import {
   buildReportAnalyticsQuery,
@@ -61,24 +61,38 @@ export async function loadReportDataset(): Promise<void> {
   }
 }
 
+/**
+ * 筛选监听挂在游离作用域上，不随第一个打开的报表页销毁。
+ *
+ * 四个报表页共用一份 `reportFilter`，所以只需要一个监听、也只应有一个。但它必须
+ * 由「模块」持有，而不是由「第一个调用 `useReportDataset()` 的组件」持有：在后端菜单
+ * 资源没有开启缓存（`cacheable`）时，页面组件切走就会被卸载，普通 `watch` 会跟着组件
+ * 的 effect scope 一起停掉；而 `filterWatcherInstalled` 已置为 true，之后任何页面都
+ * 不会重新注册 —— 表现是离开过报表页之后，改筛选不再触发重查，看起来像「筛选不起效果」。
+ * `effectScope(true)` 是游离作用域，生命周期与模块一致，切页面不受影响。
+ */
+const filterWatcherScope = effectScope(true)
+
 function installFilterWatcher() {
   if (filterWatcherInstalled) return
   filterWatcherInstalled = true
-  watch(
-    () => [
-      reportFilter.dateRange,
-      reportFilter.customFrom,
-      reportFilter.customTo,
-      reportFilter.campus,
-      reportFilter.department,
-      reportFilter.category,
-      reportFilter.method,
-    ],
-    () => {
-      if (debounceTimer) clearTimeout(debounceTimer)
-      debounceTimer = setTimeout(() => void loadReportDataset(), 250)
-    },
-  )
+  filterWatcherScope.run(() => {
+    watch(
+      () => [
+        reportFilter.dateRange,
+        reportFilter.customFrom,
+        reportFilter.customTo,
+        reportFilter.campus,
+        reportFilter.department,
+        reportFilter.category,
+        reportFilter.method,
+      ],
+      () => {
+        if (debounceTimer) clearTimeout(debounceTimer)
+        debounceTimer = setTimeout(() => void loadReportDataset(), 250)
+      },
+    )
+  })
 }
 
 export function resetReportDataset(): void {