diff --git a/api/@ohos.taskpool.d.ts b/api/@ohos.taskpool.d.ts
index 282a405a8..b1e2aed40 100644
--- a/api/@ohos.taskpool.d.ts
+++ b/api/@ohos.taskpool.d.ts
@@ -559,6 +559,18 @@ declare namespace taskpool {
     execute(task: Task): Promise<Object>;
   }
 
+  /**
+   * The LongTask class provides an interface to create a task that has no upper limit on execution time.
+   *
+   * @extends Task
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 12
+   */
+  class LongTask extends Task {
+  }
+
   /**
    * The State defines the task state.
    *
@@ -1043,6 +1055,18 @@ declare namespace taskpool {
    * @since 11
    */
   function getTaskPoolInfo(): TaskPoolInfo;
+
+  /**
+   * Terminate a long task.
+   *
+   * @param { LongTask } longTask - The long task want to terminate.
+   * @throws { BusinessError } 401 - The input parameters are invalid.
+   * @syscap SystemCapability.Utils.Lang
+   * @crossplatform
+   * @atomicservice
+   * @since 12
+   */
+  function terminateTask(longTask: LongTask): void;
 }
 
 export default taskpool;