diff --git a/packages/@core/base/design/src/design-tokens/default.css b/packages/@core/base/design/src/design-tokens/default.css
index 64679f85..4ce7ff95 100644
--- a/packages/@core/base/design/src/design-tokens/default.css
+++ b/packages/@core/base/design/src/design-tokens/default.css
@@ -93,6 +93,7 @@
 
   /* 基本文字大小 */
   --font-size-base: 16px;
+  --menu-font-size: calc(var(--font-size-base) * 0.875);
 
   /* =============component & UI============= */
 
diff --git a/packages/@core/preferences/src/preferences.ts b/packages/@core/preferences/src/preferences.ts
index 23c5f8be..f43bf39e 100644
--- a/packages/@core/preferences/src/preferences.ts
+++ b/packages/@core/preferences/src/preferences.ts
@@ -141,7 +141,10 @@ class PreferenceManager {
   private handleUpdates(updates: DeepPartial<Preferences>) {
     const themeUpdates = updates.theme || {};
     const appUpdates = updates.app || {};
-    if (themeUpdates && Object.keys(themeUpdates).length > 0) {
+    if (
+      (themeUpdates && Object.keys(themeUpdates).length > 0) ||
+      Reflect.has(themeUpdates, 'fontSize')
+    ) {
       updateCSSVariables(this.state);
     }
 
diff --git a/packages/@core/preferences/src/update-css-variables.ts b/packages/@core/preferences/src/update-css-variables.ts
index b00be782..6ee5f748 100644
--- a/packages/@core/preferences/src/update-css-variables.ts
+++ b/packages/@core/preferences/src/update-css-variables.ts
@@ -69,9 +69,14 @@ function updateCSSVariables(preferences: Preferences) {
 
   // 更新字体大小
   if (Reflect.has(theme, 'fontSize')) {
+    const fontSize = theme.fontSize;
     document.documentElement.style.setProperty(
       '--font-size-base',
-      `${theme.fontSize}px`,
+      `${fontSize}px`,
+    );
+    document.documentElement.style.setProperty(
+      '--menu-font-size',
+      `calc(${fontSize}px * 0.875)`,
     );
   }
 }
diff --git a/packages/@core/ui-kit/menu-ui/src/components/menu.vue b/packages/@core/ui-kit/menu-ui/src/components/menu.vue
index 624be291..237aff00 100644
--- a/packages/@core/ui-kit/menu-ui/src/components/menu.vue
+++ b/packages/@core/ui-kit/menu-ui/src/components/menu.vue
@@ -388,7 +388,7 @@ $namespace: vben;
   padding: var(--menu-item-padding-y) var(--menu-item-padding-x);
   margin: 0 var(--menu-item-margin-x) var(--menu-item-margin-y)
     var(--menu-item-margin-x);
-  font-size: var(--menu-font-size);
+  font-size: var(--menu-font-size) !important;
   color: var(--menu-item-color);
   white-space: nowrap;
   text-decoration: none;
@@ -433,6 +433,7 @@ $namespace: vben;
   max-width: var(--menu-title-width);
   overflow: hidden;
   text-overflow: ellipsis;
+  font-size: var(--menu-font-size) !important;
   white-space: nowrap;
   opacity: 1;
 }
@@ -458,7 +459,6 @@ $namespace: vben;
   --menu-item-collapse-margin-x: 0px;
   --menu-item-radius: 0px;
   --menu-item-indent: 16px;
-  --menu-font-size: calc(var(--font-size-base, 16px) * 0.875);
 
   &.is-dark {
     --menu-background-color: hsl(var(--menu));
@@ -785,7 +785,7 @@ $namespace: vben;
     width: 100%;
     height: 100%;
     padding: 0 var(--menu-item-padding-x);
-    font-size: var(--menu-font-size);
+    font-size: var(--menu-font-size) !important;
     line-height: var(--menu-item-height);
   }
 }
@@ -812,9 +812,14 @@ $namespace: vben;
 
 .#{$namespace}-sub-menu-content {
   height: var(--menu-item-height);
+  font-size: var(--menu-font-size) !important;
 
   @include menu-item;
 
+  * {
+    font-size: inherit !important;
+  }
+
   &__icon-arrow {
     position: absolute;
     top: 50%;