diff --git a/api/@ohos.update.d.ts b/api/@ohos.update.d.ts
index 8f6b97e8d4e6719d328c67f8d3df700db36de4ea..c94591121a2d737965fc6e1cf517fd4ab864f84f 100644
--- a/api/@ohos.update.d.ts
+++ b/api/@ohos.update.d.ts
@@ -927,6 +927,16 @@ declare namespace update {
      */
     effectiveMode: EffectiveMode;
 
+    /**
+     * Ota mode
+     *
+     * @type { ?OtaMode }
+     * @syscap SystemCapability.Update.UpdateService
+     * @systemapi hide for inner use.
+     * @since 18
+     */
+    otaMode?: OtaMode;
+
     /**
      * Information about the version description file
      *
@@ -1621,6 +1631,43 @@ declare namespace update {
     LIVE_AND_COLD = 3
   }
 
+  /**
+   * Enumerates ota mode.
+   *
+   * @enum { number }
+   * @syscap SystemCapability.Update.UpdateService
+   * @systemapi hide for inner use.
+   * @since 9
+   */
+  export enum OtaMode {
+    /**
+     * normal update.
+     *
+     * @syscap SystemCapability.Update.UpdateService
+     * @systemapi hide for inner use.
+     * @since 9
+     */
+    NORMAL_OTA = 0,
+
+    /**
+     * ab update.
+     *
+     * @syscap SystemCapability.Update.UpdateService
+     * @systemapi hide for inner use.
+     * @since 9
+     */
+    AB_REGULAR_OTA = 1,
+
+    /**
+     * ab stream update.
+     *
+     * @syscap SystemCapability.Update.UpdateService
+     * @systemapi hide for inner use.
+     * @since 9
+     */
+    AB_STREAM_OTA = 2
+  }
+  
   /**
    * Enumerates description type.
    *