diff --git a/api/@ohos.request.d.ts b/api/@ohos.request.d.ts
index 765fb4a1efd14d35e050b1d8625ac883640f7b2c..d3e45047147498ec461eceea48e411c5f3c15670 100644
--- a/api/@ohos.request.d.ts
+++ b/api/@ohos.request.d.ts
@@ -4639,6 +4639,30 @@ declare namespace request {
        * @since 12
        */
       off(event: 'response', callback?: Callback<HttpResponse>): void;
+      /**
+       * Enables the 'fault' callback.
+       * This callback is triggered when the task failed.
+       * The returned `Fault` will contain the reason why the task failed.
+       *
+       * @param { 'fault' } event - event types.
+       * @param { Callback<Faults> } callback - callback function with a `Faults` argument.
+       * @throws { BusinessError } 401 - Parameter error. Possible causes: 1. Missing mandatory parameters.
+       * <br>2. Incorrect parameter type. 3. Parameter verification failed.
+       * @syscap SystemCapability.Request.FileTransferAgent
+       * @since 20
+       */
+      on(event: 'fault', callback: Callback<Faults>): void;
+      /**
+       * Disables the 'fault' callback.
+       *
+       * @param { 'fault' } event - event types.
+       * @param { Callback<Faults> } callback - callback function with a `Faults` argument.
+       * @throws { BusinessError } 401 - Parameter error. Possible causes: 1. Missing mandatory parameters.
+       * <br>2. Incorrect parameter type. 3. Parameter verification failed.
+       * @syscap SystemCapability.Request.FileTransferAgent
+       * @since 20
+       */
+      off(event: 'fault', callback?: Callback<Faults>): void;
       /**
        * Starts the task.
        *