diff --git a/packages/backend/src/repositories/appearance.repository.ts b/packages/backend/src/repositories/appearance.repository.ts
index 6c69e47..c772ec8 100644
--- a/packages/backend/src/repositories/appearance.repository.ts
+++ b/packages/backend/src/repositories/appearance.repository.ts
@@ -49,6 +49,9 @@ let terminalTextStrokeEnabledFound = false;
             case 'terminalFontSize':
                 settings.terminalFontSize = parseInt(row.value, 10);
                 break;
+            case 'terminalFontSizeMobile':
+                settings.terminalFontSizeMobile = parseInt(row.value, 10);
+                break;
             case 'editorFontSize':
                 settings.editorFontSize = parseInt(row.value, 10);
                 break;
@@ -117,6 +120,7 @@ case 'terminalTextStrokeEnabled':
         activeTerminalThemeId: settings.activeTerminalThemeId ?? defaults.activeTerminalThemeId,
         terminalFontFamily: settings.terminalFontFamily ?? defaults.terminalFontFamily,
         terminalFontSize: settings.terminalFontSize ?? defaults.terminalFontSize,
+        terminalFontSizeMobile: settings.terminalFontSizeMobile ?? defaults.terminalFontSizeMobile,
         editorFontSize: settings.editorFontSize ?? defaults.editorFontSize,
         editorFontFamily: settings.editorFontFamily ?? defaults.editorFontFamily,
         terminalBackgroundImage: settings.terminalBackgroundImage ?? defaults.terminalBackgroundImage,
@@ -166,6 +170,7 @@ const getDefaultAppearanceSettings = (): Omit<AppearanceSettings, '_id'> => {
         activeTerminalThemeId: null, // 初始默认应为 null
         terminalFontFamily: 'Consolas, "Courier New", monospace, "Microsoft YaHei", "微软雅黑"',
         terminalFontSize: 14,
+        terminalFontSizeMobile: 14, // 移动端默认字体大小
         editorFontSize: 14,
         editorFontFamily: 'Consolas, "Noto Sans SC", "Microsoft YaHei"',
         terminalBackgroundImage: undefined,
@@ -206,6 +211,7 @@ export const ensureDefaultSettingsExist = async (db: sqlite3.Database): Promise<
         { key: 'activeTerminalThemeId', value: null }, // 以 null 开始
         { key: 'terminalFontFamily', value: defaults.terminalFontFamily },
         { key: 'terminalFontSize', value: defaults.terminalFontSize },
+        { key: 'terminalFontSizeMobile', value: defaults.terminalFontSizeMobile },
         { key: 'editorFontSize', value: defaults.editorFontSize },
         { key: 'editorFontFamily', value: defaults.editorFontFamily },
         { key: 'terminalBackgroundImage', value: defaults.terminalBackgroundImage ?? '' }, // 数据库中使用空字符串
diff --git a/packages/backend/src/services/appearance.service.ts b/packages/backend/src/services/appearance.service.ts
index f3d429d..ad82e08 100644
--- a/packages/backend/src/services/appearance.service.ts
+++ b/packages/backend/src/services/appearance.service.ts
@@ -94,6 +94,16 @@ export const updateSettings = async (settingsDto: UpdateAppearanceDto): Promise<
       settingsDto.terminalFontSize = size;
   }
 
+  // 验证 terminalFontSizeMobile (如果提供了)
+  if (settingsDto.terminalFontSizeMobile !== undefined && settingsDto.terminalFontSizeMobile !== null) {
+      const size = Number(settingsDto.terminalFontSizeMobile);
+      if (isNaN(size) || size <= 0) {
+          throw new Error(`无效的移动端终端字体大小: ${settingsDto.terminalFontSizeMobile}。必须是一个正数。`);
+      }
+      // 确保类型正确传递给仓库层
+      settingsDto.terminalFontSizeMobile = size;
+  }
+
   // 验证 editorFontSize (如果提供了)
   if (settingsDto.editorFontSize !== undefined && settingsDto.editorFontSize !== null) {
       const size = Number(settingsDto.editorFontSize);
diff --git a/packages/backend/src/types/appearance.types.ts b/packages/backend/src/types/appearance.types.ts
index 423e1e3..5d39ffb 100644
--- a/packages/backend/src/types/appearance.types.ts
+++ b/packages/backend/src/types/appearance.types.ts
@@ -13,6 +13,7 @@ export interface AppearanceSettings {
   activeTerminalThemeId?: number | null; // 修改为数字 ID 或 null
   terminalFontFamily?: string; // 终端字体列表字符串
   terminalFontSize?: number; // 终端字体大小 (px)
+  terminalFontSizeMobile?: number; // 移动端终端字体大小 (px)
   terminalBackgroundImage?: string; // 终端背景图片 URL 或路径
   pageBackgroundImage?: string; // 页面背景图片 URL 或路径
   editorFontSize?: number; // 编辑器字体大小 (px)