diff --git a/backgroundtasks/transient/include/transient_task_api.h b/backgroundtasks/transient/include/transient_task_api.h
index f84f0b29bbd29c9c9b23efab9da757a2247c4c47..f6ce7b65929ee41f1a59318c332a5edaeb01b555 100644
--- a/backgroundtasks/transient/include/transient_task_api.h
+++ b/backgroundtasks/transient/include/transient_task_api.h
@@ -105,11 +105,9 @@ int32_t OH_BackgroundTaskManager_CancelSuspendDelay(int32_t requestId);
  *
  * @param transientTaskInfo Indicates the transient task info of an application.
  * @return {@link ERR_TRANSIENT_TASK_OK} 0 - Success.
- *         {@link ERR_TRANSIENT_TASK_INVALID_PARAM} 401 - Invalid parameter.
- *         {@link ERR_TRANSIENT_TASK_PARCEL_FAILED} 9800001 - Memory operation failed.
- *         {@link ERR_TRANSIENT_TASK_PARCEL_FAILED} 9800002 - Parcelable failed.
- *         {@link ERR_TRANSIENT_TASK_SYS_NOT_READY} 9800004 - System service not ready.
- * @syscap SystemCapability.ResourceSchedule.BackgroundTaskManager.TransientTask
+ *         {@link ERR_TRANSIENT_TASK_CLIENT_INFO_VERIFICATION_FAILED} 9900001 - uid or pid info verify failed.
+ *         {@link ERR_TRANSIENT_TASK_PARCELABLE_FAILED} 9900003 - Failed to write data into parcel.
+ *         {@link ERR_TRANSIENT_TASK_SERVICE_NOT_READY} 9900004 - System service operation failed.
  * @since 20
  * @version 1.0
  */
diff --git a/backgroundtasks/transient/include/transient_task_type.h b/backgroundtasks/transient/include/transient_task_type.h
index 57539f8857895b1158f2153a6f80104e953debb4..237da3a12e8307f7aa616f524cb70eeb1e5624f8 100644
--- a/backgroundtasks/transient/include/transient_task_type.h
+++ b/backgroundtasks/transient/include/transient_task_type.h
@@ -42,6 +42,11 @@
 extern "C" {
 #endif
 
+/**
+ * @brief max number for transient task.
+ *
+ * @since 20
+ */
 #define TRANSIENT_TASK_MAX_NUM 3
 
 /**
@@ -79,6 +84,16 @@ typedef enum TransientTask_ErrorCode {
      * Transient task verification failed.
      */
     ERR_TRANSIENT_TASK_SERVICE_VERIFICATION_FAILED = 9900002,
+    /**
+     * @error Failed to write data into parcel. Possible reasons:
+     * 1. Invalid parameters;
+     * 2. Failed to apply for memory.
+     */
+    ERR_TRANSIENT_TASK_PARCELABLE_FAILED = 9900003,
+    /**
+     * @error System service operation failed.
+     */
+    ERR_TRANSIENT_TASK_SERVICE_NOT_READY = 9900004,
 } TransientTask_ErrorCode;
 
 /**