diff --git a/packages/fineui/typescript/core/base.ts b/packages/fineui/typescript/core/base.ts
index be506f32c..e347747cf 100644
--- a/packages/fineui/typescript/core/base.ts
+++ b/packages/fineui/typescript/core/base.ts
@@ -400,6 +400,8 @@ export declare function getDate(...args: (number | string)[]): Date;
 
 export declare function getTime(...args: any[]): number;
 
+export declare function clamp(number: number, lower: number, upper: number): number;
+
 /**
  * 判断一个对象是不是promise
  * @param obj 对象