diff --git a/src/layouts/modules/global-menu/context/index.ts b/src/layouts/modules/global-menu/context/index.ts
index b83b71b3..48313a34 100644
--- a/src/layouts/modules/global-menu/context/index.ts
+++ b/src/layouts/modules/global-menu/context/index.ts
@@ -3,6 +3,7 @@ import { useRoute } from 'vue-router';
 import { useContext } from '@sa/hooks';
 import type { RouteKey } from '@elegant-router/types';
 import { useRouteStore } from '@/store/modules/route';
+import { useThemeStore } from '@/store/modules/theme';
 import { useRouterPush } from '@/hooks/common/router';
 
 export const [provideMixMenuContext, useMixMenuContext] = useContext('MixMenu', useMixMenu);
@@ -10,6 +11,7 @@ export const [provideMixMenuContext, useMixMenuContext] = useContext('MixMenu',
 function useMixMenu() {
   const route = useRoute();
   const routeStore = useRouteStore();
+  const themeStore = useThemeStore();
   const { selectedKey } = useMenu();
   const { routerPushByKeyWithMetaQuery } = useRouterPush();
 
@@ -100,10 +102,46 @@ function useMixMenu() {
     () => secondLevelMenus.value.find(menu => menu.key === activeSecondLevelMenuKey.value)?.children || []
   );
 
+  const hasChildLevelMenus = computed(() => childLevelMenus.value.length > 0);
+
+  function getDeepestLevelMenuKey(): RouteKey | null {
+    if (!secondLevelMenus.value.length || !themeStore.sider.autoSelectFirstMenu) {
+      return null;
+    }
+
+    const secondLevelFirstMenu = secondLevelMenus.value[0];
+
+    if (!secondLevelFirstMenu) {
+      return null;
+    }
+
+    function findDeepest(menu: App.Global.Menu): RouteKey {
+      if (!menu.children?.length) {
+        return menu.routeKey;
+      }
+
+      return findDeepest(menu.children[0]);
+    }
+
+    return findDeepest(secondLevelFirstMenu);
+  }
+
+  function activeDeepestLevelMenuKey() {
+    const deepestLevelMenuKey = getDeepestLevelMenuKey();
+    if (!deepestLevelMenuKey) return;
+
+    // select the deepest second level menu
+    handleSelectSecondLevelMenu(deepestLevelMenuKey);
+  }
+
   watch(
     () => route.name,
     () => {
       getActiveFirstLevelMenuKey();
+      // if there are child level menus, get the active second level menu key
+      if (hasChildLevelMenus.value) {
+        getActiveSecondLevelMenuKey();
+      }
     },
     { immediate: true }
   );
@@ -121,7 +159,10 @@ function useMixMenu() {
     isActiveSecondLevelMenuHasChildren,
     handleSelectSecondLevelMenu,
     getActiveSecondLevelMenuKey,
-    childLevelMenus
+    childLevelMenus,
+    hasChildLevelMenus,
+    getDeepestLevelMenuKey,
+    activeDeepestLevelMenuKey
   };
 }
 
diff --git a/src/layouts/modules/global-menu/modules/top-hybrid-header-first.vue b/src/layouts/modules/global-menu/modules/top-hybrid-header-first.vue
index 937e5933..b312f421 100644
--- a/src/layouts/modules/global-menu/modules/top-hybrid-header-first.vue
+++ b/src/layouts/modules/global-menu/modules/top-hybrid-header-first.vue
@@ -2,6 +2,7 @@
 import { ref, watch } from 'vue';
 import { useRoute } from 'vue-router';
 import { SimpleScrollbar } from '@sa/materials';
+import type { RouteKey } from '@elegant-router/types';
 import { GLOBAL_HEADER_MENU_ID, GLOBAL_SIDER_MENU_ID } from '@/constants/app';
 import { useAppStore } from '@/store/modules/app';
 import { useThemeStore } from '@/store/modules/theme';
@@ -18,12 +19,28 @@ const appStore = useAppStore();
 const themeStore = useThemeStore();
 const routeStore = useRouteStore();
 const { routerPushByKeyWithMetaQuery } = useRouterPush();
-const { firstLevelMenus, secondLevelMenus, activeFirstLevelMenuKey, handleSelectFirstLevelMenu } =
-  useMixMenuContext('TopHybridHeaderFirst');
+const {
+  firstLevelMenus,
+  secondLevelMenus,
+  activeFirstLevelMenuKey,
+  handleSelectFirstLevelMenu,
+  activeDeepestLevelMenuKey
+} = useMixMenuContext('TopHybridHeaderFirst');
 const { selectedKey } = useMenu();
 
 const expandedKeys = ref<string[]>([]);
 
+/**
+ * Handle first level menu select
+ * @param key RouteKey
+ */
+function handleSelectMenu(key: RouteKey) {
+  handleSelectFirstLevelMenu(key);
+
+  // if there are second level menus, select the deepest one by default
+  activeDeepestLevelMenuKey();
+}
+
 function updateExpandedKeys() {
   if (appStore.siderCollapse || !selectedKey.value) {
     expandedKeys.value = [];
@@ -49,7 +66,7 @@ watch(
       :options="firstLevelMenus"
       :indent="18"
       responsive
-      @update:value="handleSelectFirstLevelMenu"
+      @update:value="handleSelectMenu"
     />
   </Teleport>
   <Teleport :to="`#${GLOBAL_SIDER_MENU_ID}`">
diff --git a/src/layouts/modules/global-menu/modules/top-hybrid-sidebar-first.vue b/src/layouts/modules/global-menu/modules/top-hybrid-sidebar-first.vue
index ff037723..d12189e8 100644
--- a/src/layouts/modules/global-menu/modules/top-hybrid-sidebar-first.vue
+++ b/src/layouts/modules/global-menu/modules/top-hybrid-sidebar-first.vue
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import type { RouteKey } from '@elegant-router/types';
 import { GLOBAL_HEADER_MENU_ID, GLOBAL_SIDER_MENU_ID } from '@/constants/app';
 import { useAppStore } from '@/store/modules/app';
 import { useThemeStore } from '@/store/modules/theme';
@@ -13,9 +14,25 @@ defineOptions({
 const appStore = useAppStore();
 const themeStore = useThemeStore();
 const { routerPushByKeyWithMetaQuery } = useRouterPush();
-const { firstLevelMenus, secondLevelMenus, activeFirstLevelMenuKey, handleSelectFirstLevelMenu } =
-  useMixMenuContext('TopHybridSidebarFirst');
+const {
+  firstLevelMenus,
+  secondLevelMenus,
+  activeFirstLevelMenuKey,
+  handleSelectFirstLevelMenu,
+  activeDeepestLevelMenuKey
+} = useMixMenuContext('TopHybridSidebarFirst');
 const { selectedKey } = useMenu();
+
+/**
+ * Handle first level menu select
+ * @param key RouteKey
+ */
+function handleSelectMenu(key: RouteKey) {
+  handleSelectFirstLevelMenu(key);
+
+  // if there are second level menus, select the deepest one by default
+  activeDeepestLevelMenuKey();
+}
 </script>
 
 <template>
@@ -37,7 +54,7 @@ const { selectedKey } = useMenu();
         :sider-collapse="appStore.siderCollapse"
         :dark-mode="themeStore.darkMode"
         :theme-color="themeStore.themeColor"
-        @select="handleSelectFirstLevelMenu"
+        @select="handleSelectMenu"
         @toggle-sider-collapse="appStore.toggleSiderCollapse"
       />
     </div>
diff --git a/src/layouts/modules/global-menu/modules/vertical-hybrid-header-first.vue b/src/layouts/modules/global-menu/modules/vertical-hybrid-header-first.vue
index 11b89733..336d6510 100644
--- a/src/layouts/modules/global-menu/modules/vertical-hybrid-header-first.vue
+++ b/src/layouts/modules/global-menu/modules/vertical-hybrid-header-first.vue
@@ -33,15 +33,15 @@ const {
   isActiveSecondLevelMenuHasChildren,
   handleSelectSecondLevelMenu,
   getActiveSecondLevelMenuKey,
-  childLevelMenus
+  childLevelMenus,
+  hasChildLevelMenus,
+  activeDeepestLevelMenuKey
 } = useMixMenuContext('VerticalHybridHeaderFirst');
 const { selectedKey } = useMenu();
 
 const inverted = computed(() => !themeStore.darkMode && themeStore.sider.inverted);
 
-const hasChildMenus = computed(() => childLevelMenus.value.length > 0);
-
-const showDrawer = computed(() => hasChildMenus.value && (drawerVisible.value || appStore.mixSiderFixed));
+const showDrawer = computed(() => hasChildLevelMenus.value && (drawerVisible.value || appStore.mixSiderFixed));
 
 function handleSelectMixMenu(key: RouteKey) {
   handleSelectSecondLevelMenu(key);
@@ -51,12 +51,33 @@ function handleSelectMixMenu(key: RouteKey) {
   }
 }
 
+/**
+ * Handle second level menu selection based on autoSelectFirstMenu setting:
+ * - When disabled: Activate first second-level menu for display only, expand third-level menu if exists
+ * - When enabled: Navigate to the deepest menu automatically
+ */
 function handleSelectMenu(key: RouteKey) {
   handleSelectFirstLevelMenu(key);
 
-  if (secondLevelMenus.value.length > 0) {
-    handleSelectMixMenu(secondLevelMenus.value[0].routeKey);
+  if (secondLevelMenus.value.length === 0) return;
+
+  const secondFirstMenuKey = secondLevelMenus.value[0].routeKey;
+
+  // Case 1: autoSelectFirstMenu disabled - only activate menu for display
+  if (!themeStore.sider.autoSelectFirstMenu) {
+    // Check if there are third-level menus
+    const hasChildren = secondLevelMenus.value.find(menu => menu.key === secondFirstMenuKey)?.children?.length;
+
+    // If there are third-level menus, expand them
+    if (hasChildren) {
+      handleSelectMixMenu(secondFirstMenuKey);
+    }
+    return;
   }
+
+  // Case 2: autoSelectFirstMenu enabled - navigate to deepest menu
+  activeDeepestLevelMenuKey();
+  setDrawerVisible(false);
 }
 
 function handleResetActiveMenu() {
@@ -114,7 +135,9 @@ watch(
       </FirstLevelMenu>
       <div
         class="relative h-full transition-width-300"
-        :style="{ width: appStore.mixSiderFixed && hasChildMenus ? themeStore.sider.mixChildMenuWidth + 'px' : '0px' }"
+        :style="{
+          width: appStore.mixSiderFixed && hasChildLevelMenus ? themeStore.sider.mixChildMenuWidth + 'px' : '0px'
+        }"
       >
         <DarkModeContainer
           class="absolute-lt h-full flex-col-stretch nowrap-hidden shadow-sm transition-all-300"
diff --git a/src/layouts/modules/theme-drawer/modules/layout/modules/sider-settings.vue b/src/layouts/modules/theme-drawer/modules/layout/modules/sider-settings.vue
index eaea7108..ba87bd73 100644
--- a/src/layouts/modules/theme-drawer/modules/layout/modules/sider-settings.vue
+++ b/src/layouts/modules/theme-drawer/modules/layout/modules/sider-settings.vue
@@ -12,6 +12,7 @@ const themeStore = useThemeStore();
 
 const layoutMode = computed(() => themeStore.layout.mode);
 const isMixLayoutMode = computed(() => layoutMode.value.includes('mix') || layoutMode.value.includes('hybrid'));
+const isHybridLayoutMode = computed(() => layoutMode.value.includes('hybrid'));
 </script>
 
 <template>
@@ -32,6 +33,12 @@ const isMixLayoutMode = computed(() => layoutMode.value.includes('mix') || layou
     <SettingItem v-if="layoutMode === 'vertical-mix'" key="5" :label="$t('theme.layout.sider.mixChildMenuWidth')">
       <NInputNumber v-model:value="themeStore.sider.mixChildMenuWidth" size="small" :step="1" class="w-120px" />
     </SettingItem>
+    <SettingItem v-if="isHybridLayoutMode" key="6" :label="$t('theme.layout.sider.autoSelectFirstMenu')">
+      <template #suffix>
+        <IconTooltip :desc="$t('theme.layout.sider.autoSelectFirstMenuTip')" />
+      </template>
+      <NSwitch v-model:value="themeStore.sider.autoSelectFirstMenu" />
+    </SettingItem>
   </TransitionGroup>
 </template>
 
diff --git a/src/locales/langs/en-us.ts b/src/locales/langs/en-us.ts
index a7b383fd..40ee8ac8 100644
--- a/src/locales/langs/en-us.ts
+++ b/src/locales/langs/en-us.ts
@@ -160,7 +160,10 @@ const local: App.I18n.Schema = {
         collapsedWidth: 'Sider Collapsed Width',
         mixWidth: 'Mix Sider Width',
         mixCollapsedWidth: 'Mix Sider Collapse Width',
-        mixChildMenuWidth: 'Mix Child Menu Width'
+        mixChildMenuWidth: 'Mix Child Menu Width',
+        autoSelectFirstMenu: 'Auto Select First Submenu',
+        autoSelectFirstMenuTip:
+          'When a first-level menu is clicked, the first submenu is automatically selected and navigated to the deepest level'
       },
       footer: {
         title: 'Footer Settings',
diff --git a/src/locales/langs/zh-cn.ts b/src/locales/langs/zh-cn.ts
index 7de2ee34..5aff07a0 100644
--- a/src/locales/langs/zh-cn.ts
+++ b/src/locales/langs/zh-cn.ts
@@ -157,7 +157,9 @@ const local: App.I18n.Schema = {
         collapsedWidth: '侧边栏折叠宽度',
         mixWidth: '混合布局侧边栏宽度',
         mixCollapsedWidth: '混合布局侧边栏折叠宽度',
-        mixChildMenuWidth: '混合布局子菜单宽度'
+        mixChildMenuWidth: '混合布局子菜单宽度',
+        autoSelectFirstMenu: '自动选择第一个子菜单',
+        autoSelectFirstMenuTip: '点击一级菜单时，自动选择并导航到第一个子菜单的最深层级'
       },
       footer: {
         title: '底部设置',
diff --git a/src/theme/settings.ts b/src/theme/settings.ts
index 1ff8cbb6..a1bc8f25 100644
--- a/src/theme/settings.ts
+++ b/src/theme/settings.ts
@@ -48,7 +48,8 @@ export const themeSettings: App.Theme.ThemeSetting = {
     collapsedWidth: 64,
     mixWidth: 90,
     mixCollapsedWidth: 64,
-    mixChildMenuWidth: 200
+    mixChildMenuWidth: 200,
+    autoSelectFirstMenu: false
   },
   footer: {
     visible: true,
diff --git a/src/typings/app.d.ts b/src/typings/app.d.ts
index 6778fc7b..c506c3a9 100644
--- a/src/typings/app.d.ts
+++ b/src/typings/app.d.ts
@@ -96,6 +96,8 @@ declare namespace App {
         mixCollapsedWidth: number;
         /** Child menu width when the layout is 'vertical-mix', 'top-hybrid-sidebar-first', or 'top-hybrid-header-first' */
         mixChildMenuWidth: number;
+        /** Whether to auto select the first submenu */
+        autoSelectFirstMenu: boolean;
       };
       /** Footer */
       footer: {
@@ -429,6 +431,8 @@ declare namespace App {
             mixWidth: string;
             mixCollapsedWidth: string;
             mixChildMenuWidth: string;
+            autoSelectFirstMenu: string;
+            autoSelectFirstMenuTip: string;
           };
           footer: {
             title: string;