diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 2125400..0d8db66 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,8 +1,8 @@
 import React, { useState, useEffect } from 'react';
-import { Layout, Button, ConfigProvider, theme, Dropdown, MenuProps, message, Modal, Spin, Slider, Progress } from 'antd';
+import { Layout, Button, ConfigProvider, theme, Dropdown, MenuProps, message, Modal, Spin, Slider, Progress, Switch } from 'antd';
 import zhCN from 'antd/locale/zh_CN';
 import { PlusOutlined, BulbOutlined, BulbFilled, ConsoleSqlOutlined, UploadOutlined, DownloadOutlined, CloudDownloadOutlined, BugOutlined, ToolOutlined, InfoCircleOutlined, GithubOutlined, SkinOutlined, CheckOutlined, MinusOutlined, BorderOutlined, CloseOutlined, SettingOutlined } from '@ant-design/icons';
-import { Environment, EventsOn } from '../wailsjs/runtime/runtime';
+import { Environment, EventsOn, WindowFullscreen, WindowIsFullscreen, WindowIsMaximised, WindowMaximise } from '../wailsjs/runtime/runtime';
 import Sidebar from './components/Sidebar';
 import TabManager from './components/TabManager';
 import ConnectionModal from './components/ConnectionModal';
@@ -26,6 +26,8 @@ function App() {
   const setTheme = useStore(state => state.setTheme);
   const appearance = useStore(state => state.appearance);
   const setAppearance = useStore(state => state.setAppearance);
+  const startupFullscreen = useStore(state => state.startupFullscreen);
+  const setStartupFullscreen = useStore(state => state.setStartupFullscreen);
   const darkMode = themeMode === 'dark';
   const effectiveOpacity = normalizeOpacityForPlatform(appearance.opacity);
   const effectiveBlur = normalizeBlurForPlatform(appearance.blur);
@@ -56,6 +58,84 @@ function App() {
       };
   }, []);
 
+  useEffect(() => {
+      let cancelled = false;
+      let startupWindowTimer: number | null = null;
+      const maxApplyAttempts = 6;
+      const applyRetryDelayMs = 400;
+      const settleDelayMs = 160;
+
+      const checkStartupPreferenceApplied = async (): Promise<boolean> => {
+          try {
+              if (await WindowIsFullscreen()) {
+                  return true;
+              }
+          } catch (_) {
+              // ignore
+          }
+          try {
+              if (await WindowIsMaximised()) {
+                  return true;
+              }
+          } catch (_) {
+              // ignore
+          }
+          return false;
+      };
+
+      const applyStartupWindowPreference = (attempt: number) => {
+          if (startupWindowTimer !== null) {
+              window.clearTimeout(startupWindowTimer);
+          }
+          startupWindowTimer = window.setTimeout(() => {
+              if (cancelled) {
+                  return;
+              }
+              if (!useStore.getState().startupFullscreen) {
+                  return;
+              }
+              Promise.resolve()
+                  .then(async () => {
+                      if (await checkStartupPreferenceApplied()) {
+                          return;
+                      }
+                      // 优先尝试全屏，若当前平台/时机不生效，后续走最大化兜底。
+                      WindowFullscreen();
+                      await new Promise((resolve) => window.setTimeout(resolve, settleDelayMs));
+                      if (await checkStartupPreferenceApplied()) {
+                          return;
+                      }
+                      WindowMaximise();
+                      await new Promise((resolve) => window.setTimeout(resolve, settleDelayMs));
+                      if (await checkStartupPreferenceApplied()) {
+                          return;
+                      }
+                      if (attempt < maxApplyAttempts) {
+                          applyStartupWindowPreference(attempt + 1);
+                      }
+                  });
+          }, 300);
+      };
+
+      if (useStore.persist.hasHydrated()) {
+          applyStartupWindowPreference(1);
+      }
+      const unsubscribeHydration = useStore.persist.onFinishHydration(() => {
+          if (cancelled) {
+              return;
+          }
+          applyStartupWindowPreference(1);
+      });
+
+      return () => {
+          cancelled = true;
+          if (startupWindowTimer !== null) {
+              window.clearTimeout(startupWindowTimer);
+          }
+          unsubscribeHydration();
+      };
+  }, []);
+
   // Background Helper
   const getBg = (darkHex: string, lightHex: string) => {
       if (!darkMode) return `rgba(255, 255, 255, ${effectiveOpacity})`; // Light mode usually white
@@ -915,6 +995,16 @@ function App() {
                           </>
                       )}
                   </div>
+                  <div>
+                      <div style={{ marginBottom: 8, fontWeight: 500 }}>启动窗口</div>
+                      <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 12 }}>
+                          <span>启动时全屏</span>
+                          <Switch checked={startupFullscreen} onChange={(checked) => setStartupFullscreen(checked)} />
+                      </div>
+                      <div style={{ fontSize: 12, color: '#888', marginTop: 4 }}>
+                          * 修改后下次启动生效
+                      </div>
+                  </div>
               </div>
           </Modal>
 
diff --git a/frontend/src/store.ts b/frontend/src/store.ts
index 5dd95a1..b1dddbd 100644
--- a/frontend/src/store.ts
+++ b/frontend/src/store.ts
@@ -3,6 +3,7 @@ import { persist } from 'zustand/middleware';
 import { ConnectionConfig, SavedConnection, TabData, SavedQuery } from './types';
 
 const DEFAULT_APPEARANCE = { opacity: 1.0, blur: 0 };
+const DEFAULT_STARTUP_FULLSCREEN = false;
 const LEGACY_DEFAULT_OPACITY = 0.95;
 const OPACITY_EPSILON = 1e-6;
 const MAX_URI_LENGTH = 4096;
@@ -295,6 +296,7 @@ interface AppState {
   savedQueries: SavedQuery[];
   theme: 'light' | 'dark';
   appearance: { opacity: number; blur: number };
+  startupFullscreen: boolean;
   sqlFormatOptions: { keywordCase: 'upper' | 'lower' };
   queryOptions: QueryOptions;
   sqlLogs: SqlLog[];
@@ -321,6 +323,7 @@ interface AppState {
 
   setTheme: (theme: 'light' | 'dark') => void;
   setAppearance: (appearance: Partial<{ opacity: number; blur: number }>) => void;
+  setStartupFullscreen: (enabled: boolean) => void;
   setSqlFormatOptions: (options: { keywordCase: 'upper' | 'lower' }) => void;
   setQueryOptions: (options: Partial<QueryOptions>) => void;
 
@@ -409,6 +412,10 @@ const sanitizeAppearance = (
   return nextAppearance;
 };
 
+const sanitizeStartupFullscreen = (value: unknown): boolean => {
+  return value === true;
+};
+
 const unwrapPersistedAppState = (persistedState: unknown): Record<string, unknown> => {
   if (!persistedState || typeof persistedState !== 'object') {
     return {};
@@ -430,6 +437,7 @@ export const useStore = create<AppState>()(
       savedQueries: [],
       theme: 'light',
       appearance: { ...DEFAULT_APPEARANCE },
+      startupFullscreen: DEFAULT_STARTUP_FULLSCREEN,
       sqlFormatOptions: { keywordCase: 'upper' },
       queryOptions: { maxRows: 5000, showColumnComment: true, showColumnType: true },
       sqlLogs: [],
@@ -541,6 +549,7 @@ export const useStore = create<AppState>()(
 
       setTheme: (theme) => set({ theme }),
       setAppearance: (appearance) => set((state) => ({ appearance: { ...state.appearance, ...appearance } })),
+      setStartupFullscreen: (enabled) => set({ startupFullscreen: !!enabled }),
       setSqlFormatOptions: (options) => set({ sqlFormatOptions: options }),
       setQueryOptions: (options) => set((state) => ({ queryOptions: { ...state.queryOptions, ...options } })),
 
@@ -578,6 +587,7 @@ export const useStore = create<AppState>()(
         nextState.savedQueries = sanitizeSavedQueries(state.savedQueries);
         nextState.theme = sanitizeTheme(state.theme);
         nextState.appearance = sanitizeAppearance(state.appearance, version);
+        nextState.startupFullscreen = sanitizeStartupFullscreen(state.startupFullscreen);
         nextState.sqlFormatOptions = sanitizeSqlFormatOptions(state.sqlFormatOptions);
         nextState.queryOptions = sanitizeQueryOptions(state.queryOptions);
         nextState.tableAccessCount = sanitizeTableAccessCount(state.tableAccessCount);
@@ -593,6 +603,7 @@ export const useStore = create<AppState>()(
           savedQueries: sanitizeSavedQueries(state.savedQueries),
           theme: sanitizeTheme(state.theme),
           appearance: sanitizeAppearance(state.appearance, 3),
+          startupFullscreen: sanitizeStartupFullscreen(state.startupFullscreen),
           sqlFormatOptions: sanitizeSqlFormatOptions(state.sqlFormatOptions),
           queryOptions: sanitizeQueryOptions(state.queryOptions),
           tableAccessCount: sanitizeTableAccessCount(state.tableAccessCount),
@@ -604,6 +615,7 @@ export const useStore = create<AppState>()(
         savedQueries: state.savedQueries,
         theme: state.theme,
         appearance: state.appearance,
+        startupFullscreen: state.startupFullscreen,
         sqlFormatOptions: state.sqlFormatOptions,
         queryOptions: state.queryOptions,
         tableAccessCount: state.tableAccessCount,