diff --git a/lightrag_webui/src/components/retrieval/QuerySettings.tsx b/lightrag_webui/src/components/retrieval/QuerySettings.tsx
index f5c8cb75..e0d7360f 100644
--- a/lightrag_webui/src/components/retrieval/QuerySettings.tsx
+++ b/lightrag_webui/src/components/retrieval/QuerySettings.tsx
@@ -279,41 +279,6 @@ export default function QuerySettings() {
               </div>
             </>
 
-            {/* History Turns */}
-            <>
-              <TooltipProvider>
-                <Tooltip>
-                  <TooltipTrigger asChild>
-                    <label htmlFor="history_turns" className="ml-1 cursor-help">
-                      {t('retrievePanel.querySettings.historyTurns')}
-                    </label>
-                  </TooltipTrigger>
-                  <TooltipContent side="left">
-                    <p>{t('retrievePanel.querySettings.historyTurnsTooltip')}</p>
-                  </TooltipContent>
-                </Tooltip>
-              </TooltipProvider>
-              <div>
-                <Input
-                  id="history_turns"
-                  type="number"
-                  value={querySettings.history_turns ?? ''}
-                  onChange={(e) => {
-                    const value = e.target.value
-                    handleChange('history_turns', value === '' ? '' : parseInt(value) || 0)
-                  }}
-                  onBlur={(e) => {
-                    const value = e.target.value
-                    if (value === '' || isNaN(parseInt(value))) {
-                      handleChange('history_turns', 0)
-                    }
-                  }}
-                  min={0}
-                  placeholder={t('retrievePanel.querySettings.historyTurnsPlaceholder')}
-                  className="h-9"
-                />
-              </div>
-            </>
 
             {/* User Prompt */}
             <>
diff --git a/lightrag_webui/src/stores/settings.ts b/lightrag_webui/src/stores/settings.ts
index 8744887a..6f616a08 100644
--- a/lightrag_webui/src/stores/settings.ts
+++ b/lightrag_webui/src/stores/settings.ts
@@ -185,10 +185,14 @@ const useSettingsStoreBase = create<SettingsState>()(
 
       setRetrievalHistory: (history: Message[]) => set({ retrievalHistory: history }),
 
-      updateQuerySettings: (settings: Partial<QueryRequest>) =>
+      updateQuerySettings: (settings: Partial<QueryRequest>) => {
+        // Filter out history_turns to prevent changes, always keep it as 0
+        const filteredSettings = { ...settings }
+        delete filteredSettings.history_turns
         set((state) => ({
-          querySettings: { ...state.querySettings, ...settings }
-        })),
+          querySettings: { ...state.querySettings, ...filteredSettings, history_turns: 0 }
+        }))
+      },
 
       setShowFileName: (show: boolean) => set({ showFileName: show }),
       setShowLegend: (show: boolean) => set({ showLegend: show }),
@@ -197,7 +201,7 @@ const useSettingsStoreBase = create<SettingsState>()(
     {
       name: 'settings-storage',
       storage: createJSONStorage(() => localStorage),
-      version: 16,
+      version: 17,
       migrate: (state: any, version: number) => {
         if (version < 2) {
           state.showEdgeLabel = false
@@ -284,6 +288,12 @@ const useSettingsStoreBase = create<SettingsState>()(
           // Add documentsPageSize field for older versions
           state.documentsPageSize = 10
         }
+        if (version < 17) {
+          // Force history_turns to 0 for all users
+          if (state.querySettings) {
+            state.querySettings.history_turns = 0
+          }
+        }
         return state
       }
     }