diff --git a/api/@internal/component/ets/common.d.ts b/api/@internal/component/ets/common.d.ts
index d410c9d35a5e2e7a03c9743edc7914167f3059b2..f58a1ad921f8a973eacf105fe98eaddf26860162 100644
--- a/api/@internal/component/ets/common.d.ts
+++ b/api/@internal/component/ets/common.d.ts
@@ -227,7 +227,7 @@ declare interface AnimateParam {
    * Animation curve.
    * @since 7
    */
-  curve?: Curve | string;
+  curve?: Curve | string | ICurve;
   /**
    * Animation playback mode. By default, the animation is played from the beginning after the playback is complete.
    * @since 7
@@ -250,6 +250,18 @@ declare interface AnimateParam {
   onFinish?: () => void;
 }
 
+/**
+ * Interface for curve object.
+ * @since 9
+ */
+interface ICurve {
+  /**
+   * Get curve value by fraction.
+   * @since 9
+   */ 
+  interpolate(fraction : number) : number;
+}
+
 /**
  * Defines the motion path options.
  * @since 7
@@ -291,7 +303,7 @@ declare interface sharedTransitionOptions {
    * Animation duration, in ms.
    * @since 7
    */
-  curve?: Curve | string;
+  curve?: Curve | string | ICurve;
   /**
    * Animation playback mode. By default, the animation is played from the beginning after the playback is complete.
    * @since 7
diff --git a/api/@internal/component/ets/middle_class.d.ts b/api/@internal/component/ets/middle_class.d.ts
index 0b11a3d26c5444c2c66e1e329e113d7a13020bd9..fe1eb5ad7812c4ef786527dd45fc456f79a9a6db 100644
--- a/api/@internal/component/ets/middle_class.d.ts
+++ b/api/@internal/component/ets/middle_class.d.ts
@@ -1012,7 +1012,7 @@ declare class TSPageTransitionEnterInterface extends CommonTransition<PageTransi
   create(value: {
     type?: RouteType;
     duration?: number;
-    curve?: Curve | string;
+    curve?: Curve | string | ICurve;
     delay?: number;
   }): PageTransitionEnterInterface;
 }
@@ -1033,7 +1033,7 @@ declare class TSPageTransitionExitInterface extends CommonTransition<PageTransit
   create(value: {
     type?: RouteType;
     duration?: number;
-    curve?: Curve | string;
+    curve?: Curve | string | ICurve;
     delay?: number;
   }): PageTransitionExitInterface;
 }
diff --git a/api/@internal/component/ets/page_transition.d.ts b/api/@internal/component/ets/page_transition.d.ts
index 9a8b56d40840cf316c2edc6deba37aa17dc3f9d2..3ae0c40a219b318c0a87622d5880cbf9eac4189d 100644
--- a/api/@internal/component/ets/page_transition.d.ts
+++ b/api/@internal/component/ets/page_transition.d.ts
@@ -109,7 +109,7 @@ interface PageTransitionEnterInterface extends CommonTransition<PageTransitionEn
    * Called when page Jump animation is used.
    * @since 7
    */
-  (value: { type?: RouteType; duration?: number; curve?: Curve | string; delay?: number }): PageTransitionEnterInterface;
+  (value: { type?: RouteType; duration?: number; curve?: Curve | string | ICurve; delay?: number }): PageTransitionEnterInterface;
 
   /**
    * Called when the incoming parameter is the normalized progress of the current incoming animation.
@@ -127,7 +127,7 @@ interface PageTransitionExitInterface extends CommonTransition<PageTransitionExi
    * Called when the transition is delayed.
    * @since 7
    */
-  (value: { type?: RouteType; duration?: number; curve?: Curve | string; delay?: number }): PageTransitionExitInterface;
+  (value: { type?: RouteType; duration?: number; curve?: Curve | string | ICurve; delay?: number }): PageTransitionExitInterface;
 
   /**
    * Called when the input parameter is the normalized progress of the current exit animation.
diff --git a/api/@internal/component/ets/swiper.d.ts b/api/@internal/component/ets/swiper.d.ts
index 1a3f7ad21e13266ac548d3837f5493a408c2b669..4831d153b5fc4963a554bf18b61e9ef313b3f758 100644
--- a/api/@internal/component/ets/swiper.d.ts
+++ b/api/@internal/component/ets/swiper.d.ts
@@ -214,7 +214,7 @@ declare class SwiperAttribute extends CommonMethod<SwiperAttribute> {
    * Called when sliding is curve
    * @since 8
    */
-  curve(value: Curve | string): SwiperAttribute;
+  curve(value: Curve | string | ICurve): SwiperAttribute;
   /**
    * Called when the index value changes.
    * @since 7
diff --git a/api/@ohos.curves.d.ts b/api/@ohos.curves.d.ts
index e3a377d6cea5acb289960fa17e9223cf55a1d2f8..359c181be7b7e50b7bb3ac2ce7f01ad5b207f261 100644
--- a/api/@ohos.curves.d.ts
+++ b/api/@ohos.curves.d.ts
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021 Huawei Device Co., Ltd.
+* Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
@@ -40,27 +40,67 @@ declare namespace curves {
     Friction,
   }
 
+  /**
+   * Interface for curve object.
+   * @since 9
+   */
+  interface ICurve {
+    /**
+    * Get curve value by fraction.
+    * @since 9
+    */ 
+     interpolate(fraction : number) : number;
+  }
+ 
+  /**
+   * Initializes the interpolator curve when called.
+   * @since 9
+   */
+  function initCure(curve?: Curve): ICurve;
+
   /**
    * Initializes the interpolator curve when called.
    * @since 7
+   * @deprecated since 9
    */
   function init(curve?: Curve): string;
 
+  /**
+   * Constructs a step curve when called.
+   * @since 9
+   */
+  function stepsCurve(count: number, end: boolean): ICurve;
+
   /**
    * Constructs a step curve when called.
    * @since 7
+   * @deprecated since 9
    */
   function steps(count: number, end: boolean): string;
 
+  /**
+   * Constructs a third-order Bezier curve when called.
+   * @since 9
+   */
+  function cubicBezierCurve(x1: number, y1: number, x2: number, y2: number): ICurve;
+
   /**
    * Constructs a third-order Bezier curve when called.
    * @since 7
+   * @deprecated since 9
    */
   function cubicBezier(x1: number, y1: number, x2: number, y2: number): string;
 
+  /**
+   * Constructs a spring curve when called.
+   * @since 9
+   */
+  function springCurve(velocity: number, mass: number, stiffness: number, damping: number): ICurve;
+
   /**
    * Constructs a spring curve when called.
    * @since 7
+   * @deprecated since 9
    */
   function spring(velocity: number, mass: number, stiffness: number, damping: number): string;
 }