diff --git a/resourceschedule/qos_manager/c/qos.h b/resourceschedule/qos_manager/c/qos.h
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+/*
+ * Copyright (c) 2023 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.
+ */
+
+#ifndef QOS_H
+#define QOS_H
+/**
+ * @addtogroup QoS
+ * @{
+ *
+ * @brief QoS provides APIs.
+ *
+ * @since 11
+ */
+
+/**
+ * @file qos.h
+ *
+ * @brief Declares the QoS interfaces in C.
+ * @library libqos.z.so
+ * @syscap SystemCapability.Resourceschedule.QoS.Core
+ * @since 11
+ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Describes the level of QoS.
+ *
+ * @since 11
+ */
+typedef enum QoS_Level {
+    /**
+     * @brief Means the QoS level is background.
+     */
+    QOS_BACKGROUND = 0,
+
+    /**
+     * @brief Means the QoS level is utility.
+     */
+    QOS_UTILITY,
+
+    /**
+     * @brief Means the QoS level is default.
+     */
+    QOS_DEFAULT,
+
+    /**
+     * @brief Means the QoS level is user-initiated.
+     */
+    QOS_USER_INITIATED,
+
+    /**
+     * @brief Means the QoS level is user-request.
+     */
+    QOS_DEADLINE_REQUEST,
+
+    /**
+     * @brief Means the QoS level is user-interactive.
+     */
+    QOS_USER_INTERACTIVE,
+} QoS_Level;
+
+/**
+ * @brief Set the QoS level of the current thread.
+ *
+ * @param level Indicates the level to set. Specific level can be referenced {@link QoS_Level}.
+ * @return Returns int32_t, return value == 0, success, otherwise value == -1, failed.
+ * @see QoS_Level
+ * @since 11
+ */
+int OH_QoS_SetThreadQoS(QoS_Level level);
+
+/**
+ * @brief Cancel the QoS level of the current thread.
+ *
+ * @return Returns int32_t, return value == 0, success, otherwise value == -1, failed.
+ * @see QoS_Level
+ * @since 11
+ */
+int OH_QoS_ResetThreadQoS();
+
+/**
+ * @brief Obtains the QoS level of the current thread.
+ *
+ * @param level This parameter is the output parameter,
+ * and the QoS level of the thread as a {@link QoS_Level} is written to this variable.
+ * @return Returns int32_t, return value == 0, success, otherwise value == -1, failed.
+ * @see QoS_Level
+ * @since 11
+ */
+int OH_QoS_GetThreadQoS(QoS_Level *level);
+#ifdef __cplusplus
+};
+#endif
+#endif // QOS_H