diff --git a/api/@ohos.systemCapability.d.ts b/api/@ohos.systemCapability.d.ts
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+/*
+  * Copyright (c) 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
+  *
+  *     http://www.apache.org/licenses/LICENSE-2.0
+  *
+  * Unless required by applicable law or agreed to in writing, software
+  * distributed under the License is distributed on an "AS IS" BASIS,
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  */
+import { AsyncCallback, Callback } from './basic.d.ts';
+
+/**
+* Provides interfaces to get system capability.
+*
+* @since 9
+* @syscap SystemCapability.Developtools.Syscap
+* @systemapi
+*/
+
+declare namespace systemCapability {
+  /**
+   * Get System Capability.
+   *
+   * @since 9
+   * @systemapi
+   * @syscap SystemCapability.Developtools.Syscap
+   * @return system capability string.
+   * @param callback indicates the system capability string result.
+   */
+  function querySystemCapabilities(callback: AsyncCallback<string>): void;
+  function querySystemCapabilities(): Promise<string>;
+}
+
+export default systemCapability;
+