diff --git a/src/component/title/install.ts b/src/component/title/install.ts
index 54fbb0e6eb..47a788aba4 100644
--- a/src/component/title/install.ts
+++ b/src/component/title/install.ts
@@ -38,6 +38,9 @@ import ExtensionAPI from '../../core/ExtensionAPI';
 import {windowOpen} from '../../util/format';
 import { EChartsExtensionInstallRegisters } from '../../extension';
 
+interface TitleTextStyleOption extends LabelOption {
+    width?: number
+}
 
 export interface TitleOption extends ComponentOption, BoxLayoutOptionMixin, BorderOptionMixin {
 
@@ -75,9 +78,9 @@ export interface TitleOption extends ComponentOption, BoxLayoutOptionMixin, Bord
      */
     itemGap?: number
 
-    textStyle?: LabelOption
+    textStyle?: TitleTextStyleOption
 
-    subtextStyle?: LabelOption
+    subtextStyle?: TitleTextStyleOption
 
     /**
      * If trigger mouse or touch event