diff --git a/distributeddatamgr/relational_store/include/relational_store.h b/distributeddatamgr/relational_store/include/relational_store.h
index 1079b1d60666f470ab2a7375d4e7db6cc6ad50fb..fcd70f2ebef0146fe0bd1d90e52d67805e6d49f6 100644
--- a/distributeddatamgr/relational_store/include/relational_store.h
+++ b/distributeddatamgr/relational_store/include/relational_store.h
@@ -556,6 +556,89 @@ typedef enum Rdb_SubscribeType {
     RDB_SUBSCRIBE_TYPE_CLOUD_DETAILS,
 } Rdb_SubscribeType;
 
+/**
+ * @brief The callback function of cloud data change event.
+ *
+ * @param context Represents the context of data observer.
+ * @param values Indicates the cloud accounts that changed.
+ * @param count The count of changed cloud accounts.
+ * @since 11
+ */
+typedef void (*Rdb_BriefObserver)(void *context, const char *values[], uint32_t count);
+
+/**
+ * @brief The callback function of cloud data change details event.
+ *
+ * @param context Represents the context of data observer.
+ * @param changeInfo Indicates the {@link Rdb_ChangeInfo} of changed tables.
+ * @param count The count of changed tables.
+ * @see Rdb_ChangeInfo.
+ * @since 11
+ */
+typedef void (*Rdb_DetailsObserver)(void *context, const Rdb_ChangeInfo **changeInfo, uint32_t count);
+
+/**
+ * @brief Indicates the callback functions.
+ *
+ * @since 11
+ */
+typedef union Rdb_SubscribeCallback {
+    /**
+     * The callback function of cloud data change details event.
+     */
+    Rdb_DetailsObserver detailsObserver;
+
+    /**
+     * The callback function of cloud data change event.
+     */
+    Rdb_BriefObserver briefObserver;
+} Rdb_SubscribeCallback;
+
+/**
+ * @brief Indicates the observer of data.
+ *
+ * @since 11
+ */
+typedef struct Rdb_DataObserver {
+    /**
+     * The context of data observer.
+     */
+    void *context;
+
+    /**
+     * The callback of data observer.
+     */
+    Rdb_SubscribeCallback callback;
+} Rdb_DataObserver;
+
+/**
+ * @brief Registers an observer for the database.
+ * When data in the distributed database changes, the callback will be invoked.
+ *
+ * @param store Represents a pointer to an {@link OH_Rdb_Store} instance.
+ * @param type Indicates the subscription type, which is defined in {@link Rdb_SubscribeType}.
+ * @param observer The {@link Rdb_DataObserver} of change events in the database.
+ * @return Returns the status code of the execution. See {@link OH_Rdb_ErrCode}.
+ * @see OH_Rdb_Store.
+ * @see Rdb_DataObserver.
+ * @since 11
+ */
+int OH_Rdb_Subscribe(OH_Rdb_Store *store, Rdb_SubscribeType type, const Rdb_DataObserver *observer);
+
+/**
+ * @brief Remove specified observer of specified type from the database.
+ *
+ * @param store Represents a pointer to an {@link OH_Rdb_Store} instance.
+ * @param type Indicates the subscription type, which is defined in {@link Rdb_SubscribeType}.
+ * @param observer The {@link Rdb_DataObserver} of change events in the database.
+ * If this is nullptr, remove all observers of the type.
+ * @return Returns the status code of the execution. See {@link OH_Rdb_ErrCode}.
+ * @see OH_Rdb_Store.
+ * @see Rdb_DataObserver.
+ * @since 11
+ */
+int OH_Rdb_Unsubscribe(OH_Rdb_Store *store, Rdb_SubscribeType type, const Rdb_DataObserver *observer);
+
 /**
  * @brief Indicates the database synchronization mode.
  *
@@ -737,6 +820,15 @@ typedef struct Rdb_ProgressDetails {
  */
 Rdb_TableDetails *OH_Rdb_GetTableDetails(Rdb_ProgressDetails *progress, int32_t version);
 
+/**
+ * @brief The callback function of progress.
+ *
+ * @param progressDetails The details of the sync progress.
+ * @see Rdb_ProgressDetails.
+ * @since 11
+ */
+typedef void (*Rdb_ProgressCallback)(void *context, Rdb_ProgressDetails *progressDetails);
+
 /**
  * @brief The callback function of sync.
  *
@@ -746,6 +838,23 @@ Rdb_TableDetails *OH_Rdb_GetTableDetails(Rdb_ProgressDetails *progress, int32_t
  */
 typedef void (*Rdb_SyncCallback)(Rdb_ProgressDetails *progressDetails);
 
+/**
+ * @brief The observer of progress.
+ *
+ * @since 11
+ */
+typedef struct Rdb_ProgressObserver {
+    /**
+     * The context of progress observer.
+     */
+    void *context;
+
+    /**
+     * The callback function of progress observer.
+     */
+    Rdb_ProgressCallback callback;
+} Rdb_ProgressObserver;
+
 /**
  * @brief Sync data to cloud.
  *
@@ -753,14 +862,41 @@ typedef void (*Rdb_SyncCallback)(Rdb_ProgressDetails *progressDetails);
  * @param mode Represents the {@link Rdb_SyncMode} of sync progress.
  * @param tables Indicates the names of tables to sync.
  * @param count The count of tables to sync. If value equals 0, sync all tables of the store.
- * @param callback The {@link Rdb_SyncCallback} of cloud sync progress.
+ * @param observer The {@link Rdb_ProgressObserver} of cloud sync progress.
  * @return Returns the status code of the execution. See {@link OH_Rdb_ErrCode}.
  * @see OH_Rdb_Store.
- * @see Rdb_SyncCallback.
+ * @see Rdb_ProgressObserver.
  * @since 11
  */
 int OH_Rdb_CloudSync(OH_Rdb_Store *store, Rdb_SyncMode mode, const char *tables[], uint32_t count,
-    Rdb_SyncCallback *callback);
+    const Rdb_ProgressObserver *observer);
+
+/**
+ * @brief Subscribes to the automatic synchronization progress of an RDB store.
+ * A callback will be invoked when there is a notification of the automatic synchronization progress.
+ *
+ * @param store Indicates the pointer to the target {@Link OH_Rdb_Store} instance.
+ * @param observer The {@link Rdb_ProgressObserver} for the automatic synchornizaiton progress.
+ * Indicates the callback invoked to return the automatic synchronization progress.
+ * @return Returns the status code of the execution. See {@link OH_Rdb_ErrCode}.
+ * @see OH_Rdb_Store.
+ * @see Rdb_ProgressObserver.
+ * @since 11
+ **/
+int OH_Rdb_SubscribeAutoSyncProgress(OH_Rdb_Store *store, const Rdb_ProgressObserver *observer);
+
+/**
+ * @brief Unsubscribes from the automatic synchronziation progress of an RDB store.
+ *
+ * @param store Indicates the pointer to the target {@Link OH_Rdb_Store} instance.
+ * @param observer Indicates the {@link Rdb_ProgressObserver} callback for the automatic synchornizaiton progress.
+ * If it is a null pointer, all callbacks for the automatic synchornizaiton progress will be unregistered.
+ * @return Returns the status code of the execution. See {@link OH_Rdb_ErrCode}.
+ * @see OH_Rdb_Store.
+ * @see Rdb_ProgressObserver.
+ * @since 11
+ */
+int OH_Rdb_UnsubscribeAutoSyncProgress(OH_Rdb_Store *store, const Rdb_ProgressObserver *observer);
 #ifdef __cplusplus
 };
 #endif