diff --git a/components/date-picker/generatePicker/interface.ts b/components/date-picker/generatePicker/interface.ts
deleted file mode 100644
index c0771f2e0c..0000000000
--- a/components/date-picker/generatePicker/interface.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import type { ComponentClass, ForwardedRef, Component } from 'react';
-import { PickerProps, RangePickerProps } from '.';
-
-export interface CommonPickerMethods {
-  focus: () => void;
-  blur: () => void;
-}
-
-export interface PickerComponentClass<P = {}, S = unknown> extends ComponentClass<P, S> {
-  new (...args: ConstructorParameters<ComponentClass<P, S>>): InstanceType<ComponentClass<P, S>> &
-    CommonPickerMethods;
-}
-
-export type PickerRef<P> = ForwardedRef<Component<P> & CommonPickerMethods>;
-
-export type DatePickRef<DateType> = PickerRef<PickerProps<DateType>>;
-
-export type RangePickerRef<DateType> = PickerRef<RangePickerProps<DateType>>;
diff --git a/components/date-picker/generatePicker/interface.tsx b/components/date-picker/generatePicker/interface.tsx
index 2daf343d66..c0771f2e0c 100644
--- a/components/date-picker/generatePicker/interface.tsx
+++ b/components/date-picker/generatePicker/interface.tsx
@@ -1,4 +1,5 @@
-import { ComponentClass } from 'react';
+import type { ComponentClass, ForwardedRef, Component } from 'react';
+import { PickerProps, RangePickerProps } from '.';
 
 export interface CommonPickerMethods {
   focus: () => void;
@@ -9,3 +10,9 @@ export interface PickerComponentClass<P = {}, S = unknown> extends ComponentClas
   new (...args: ConstructorParameters<ComponentClass<P, S>>): InstanceType<ComponentClass<P, S>> &
     CommonPickerMethods;
 }
+
+export type PickerRef<P> = ForwardedRef<Component<P> & CommonPickerMethods>;
+
+export type DatePickRef<DateType> = PickerRef<PickerProps<DateType>>;
+
+export type RangePickerRef<DateType> = PickerRef<RangePickerProps<DateType>>;