diff --git a/guoba.support.js b/guoba.support.js
index 01b4703..e9ad930 100644
--- a/guoba.support.js
+++ b/guoba.support.js
@@ -57,10 +57,21 @@ export function supportGuoba () {
         },
         {
           field: 'defaultTTSRole',
-          label: '语音模式默认橘色',
+          label: '语音模式默认角色',
           bottomHelpMessage: '语音模式下，未指定角色时使用的角色。若为空，将使用随机角色回复。',
           component: 'Input'
         },
+        {
+          field: 'ttsAutoFallbackThreshold',
+          label: '语音转文字阈值',
+          helpMessage: '语音模式下，字数超过这个阈值就降级为文字',
+          bottomHelpMessage: '语音转为文字的阈值。',
+          component: 'InputNumber',
+          componentProps: {
+            min: 0,
+            max: 299
+          }
+        },
         {
           field: 'autoUsePicture',
           label: '长文本自动转图片',
diff --git a/utils/config.js b/utils/config.js
index d555a09..8c08bef 100644
--- a/utils/config.js
+++ b/utils/config.js
@@ -10,6 +10,7 @@ const defaultConfig = {
   defaultTTSRole: '纳西妲',
   autoUsePicture: true,
   autoUsePictureThreshold: 1200,
+  ttsAutoFallbackThreshold: 99,
   conversationPreserveTime: 0,
   toggleMode: 'at',
   quoteReply: true,