diff --git a/lightrag_webui/src/components/graph/GraphLabels.tsx b/lightrag_webui/src/components/graph/GraphLabels.tsx
index 17e7a4d3..e2ac7aae 100644
--- a/lightrag_webui/src/components/graph/GraphLabels.tsx
+++ b/lightrag_webui/src/components/graph/GraphLabels.tsx
@@ -1,7 +1,8 @@
-import { useCallback, useEffect, useState } from 'react'
+import { useCallback, useEffect, useState, useRef } from 'react'
 import { AsyncSelect } from '@/components/ui/AsyncSelect'
 import { useSettingsStore } from '@/stores/settings'
 import { useGraphStore } from '@/stores/graph'
+import { useBackendState } from '@/stores/state'
 import {
   dropdownDisplayLimit,
   controlButtonVariant,
@@ -22,6 +23,11 @@ const GraphLabels = () => {
   const [refreshTrigger, setRefreshTrigger] = useState(0)
   const [selectKey, setSelectKey] = useState(0)
 
+  // Pipeline state monitoring
+  const pipelineBusy = useBackendState.use.pipelineBusy()
+  const prevPipelineBusy = useRef<boolean | undefined>(undefined)
+  const shouldRefreshPopularLabelsRef = useRef(false)
+
   // Dynamic tooltip based on current label state
   const getRefreshTooltip = useCallback(() => {
     if (isRefreshing) {
@@ -67,6 +73,49 @@ const GraphLabels = () => {
     }
   }, [dropdownRefreshTrigger])
 
+  // Monitor pipeline state changes: busy -> idle
+  useEffect(() => {
+    if (prevPipelineBusy.current === true && pipelineBusy === false) {
+      console.log('Pipeline changed from busy to idle, marking for popular labels refresh')
+      shouldRefreshPopularLabelsRef.current = true
+    }
+    prevPipelineBusy.current = pipelineBusy
+  }, [pipelineBusy])
+
+  // Helper: Reload popular labels from backend
+  const reloadPopularLabels = useCallback(async () => {
+    if (!shouldRefreshPopularLabelsRef.current) return
+
+    console.log('Reloading popular labels (triggered by pipeline idle)')
+    try {
+      const popularLabels = await getPopularLabels(popularLabelsDefaultLimit)
+      SearchHistoryManager.clearHistory()
+
+      if (popularLabels.length === 0) {
+        const fallbackLabels = ['entity', 'relationship', 'document', 'concept']
+        await SearchHistoryManager.initializeWithDefaults(fallbackLabels)
+      } else {
+        await SearchHistoryManager.initializeWithDefaults(popularLabels)
+      }
+    } catch (error) {
+      console.error('Failed to reload popular labels:', error)
+      const fallbackLabels = ['entity', 'relationship', 'document']
+      SearchHistoryManager.clearHistory()
+      await SearchHistoryManager.initializeWithDefaults(fallbackLabels)
+    } finally {
+      // Always clear the flag
+      shouldRefreshPopularLabelsRef.current = false
+    }
+  }, [])
+
+  // Helper: Bump dropdown data to trigger refresh
+  const bumpDropdownData = useCallback(({ forceSelectKey = false } = {}) => {
+    setRefreshTrigger(prev => prev + 1)
+    if (forceSelectKey) {
+      setSelectKey(prev => prev + 1)
+    }
+  }, [])
+
   const fetchData = useCallback(
     async (query?: string): Promise<string[]> => {
       let results: string[] = [];
@@ -115,6 +164,12 @@ const GraphLabels = () => {
         currentLabel = '*'
       }
 
+      // Scenario 1: Manual refresh - reload popular labels if flag is set (regardless of current label)
+      if (shouldRefreshPopularLabelsRef.current) {
+        await reloadPopularLabels()
+        bumpDropdownData({ forceSelectKey: true })
+      }
+
       if (currentLabel && currentLabel !== '*') {
         // Scenario 1: Has specific label, try to refresh current label
         console.log(`Refreshing current label: ${currentLabel}`)
@@ -135,7 +190,7 @@ const GraphLabels = () => {
         console.log('Refreshing global data and popular labels')
 
         try {
-          // Re-fetch popular labels and update search history
+          // Re-fetch popular labels and update search history (if not already done)
           const popularLabels = await getPopularLabels(popularLabelsDefaultLimit)
           SearchHistoryManager.clearHistory()
 
@@ -173,7 +228,16 @@ const GraphLabels = () => {
     } finally {
       setIsRefreshing(false)
     }
-  }, [label])
+  }, [label, reloadPopularLabels, bumpDropdownData])
+
+  // Handle dropdown before open - reload popular labels if needed
+  const handleDropdownBeforeOpen = useCallback(async () => {
+    const currentLabel = useSettingsStore.getState().queryLabel
+    if (shouldRefreshPopularLabelsRef.current && (!currentLabel || currentLabel === '*')) {
+      await reloadPopularLabels()
+      bumpDropdownData()
+    }
+  }, [reloadPopularLabels, bumpDropdownData])
 
   return (
     <div className="flex items-center">
@@ -196,6 +260,7 @@ const GraphLabels = () => {
           searchInputClassName="max-h-8"
           triggerTooltip={t('graphPanel.graphLabels.selectTooltip')}
           fetcher={fetchData}
+          onBeforeOpen={handleDropdownBeforeOpen}
           renderOption={(item) => (
             <div className="truncate" title={item}>
               {item}
diff --git a/lightrag_webui/src/components/ui/AsyncSelect.tsx b/lightrag_webui/src/components/ui/AsyncSelect.tsx
index bed0d290..87647cf4 100644
--- a/lightrag_webui/src/components/ui/AsyncSelect.tsx
+++ b/lightrag_webui/src/components/ui/AsyncSelect.tsx
@@ -43,6 +43,8 @@ export interface AsyncSelectProps<T> {
   value: string
   /** Callback when selection changes */
   onChange: (value: string) => void
+  /** Callback before opening the dropdown (async supported) */
+  onBeforeOpen?: () => void | Promise<void>
   /** Accessibility label for the select field */
   ariaLabel?: string
   /** Placeholder text when no selection */
@@ -83,6 +85,7 @@ export function AsyncSelect<T>({
   searchPlaceholder,
   value,
   onChange,
+  onBeforeOpen,
   disabled = false,
   className,
   triggerClassName,
@@ -196,8 +199,18 @@ export function AsyncSelect<T>({
     [selectedValue, onChange, clearable, options, getOptionValue]
   )
 
+  const handleOpenChange = useCallback(
+    async (newOpen: boolean) => {
+      if (newOpen && onBeforeOpen) {
+        await onBeforeOpen()
+      }
+      setOpen(newOpen)
+    },
+    [onBeforeOpen]
+  )
+
   return (
-    <Popover open={open} onOpenChange={setOpen}>
+    <Popover open={open} onOpenChange={handleOpenChange}>
       <PopoverTrigger asChild>
         <Button
           variant="outline"