diff --git a/api/@ohos.telephony.radio.d.ts b/api/@ohos.telephony.radio.d.ts
index 6c15700681d72bad69ebcd75f15e3b33db20b47a..2525430029ef1c548054f2fff1cdeb921f44321e 100644
--- a/api/@ohos.telephony.radio.d.ts
+++ b/api/@ohos.telephony.radio.d.ts
@@ -297,6 +297,42 @@ declare namespace radio {
   function getPreferredNetwork(slotId: number, callback: AsyncCallback<PreferredNetworkMode>): void;
   function getPreferredNetwork(slotId: number): Promise<PreferredNetworkMode>;
 
+  /**
+   * Get the IMS registration state info of specificed IMS service type.
+   *
+   * @param slotId Indicates the card slot index number,
+   *   ranging from 0 to the maximum card slot index number supported by the device.
+   * @param imsType Indicates the ims service type of the {@link ImsServiceType}.
+   * @param callback including an instance of the {@link ImsRegInfo} class.
+   * @permission ohos.permission.GET_TELEPHONY_STATE
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+   function getImsRegInfo(slotId: number, imsType: ImsServiceType, callback: AsyncCallback<ImsRegInfo>): void;
+   function getImsRegInfo(slotId: number, imsType: ImsServiceType): Promise<ImsRegInfo>;
+
+  /**
+   * Called when the IMS registration state of specificed IMS service type corresponding
+   *   to a monitored {@code slotId} updates.
+   *
+   * @param slotId Indicates the card slot index number,
+   *   ranging from 0 to the maximum card slot index number supported by the device.
+   * @param imsType Indicates the ims service type of the {@link ImsServiceType}.
+   * @param callback including an instance of the {@link ImsRegInfo} class.
+   * @permission ohos.permission.GET_TELEPHONY_STATE
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+  function on(type: 'imsRegStateChange', slotId: number, imsType: ImsServiceType, callback: Callback<ImsRegInfo>): void;
+
+
+  /**
+   * @permission ohos.permission.GET_TELEPHONY_STATE
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+  function off(type: 'imsRegStateChange', slotId: number, imsType: ImsServiceType, callback?: Callback<ImsRegInfo>): void;
+
   /**
    * @systemapi Hide this for inner system use.
    * @since 8
@@ -790,6 +826,46 @@ declare namespace radio {
     /** Manual network selection modes. */
     NETWORK_SELECTION_MANUAL
   }
+
+  /**
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+   export enum ImsRegState {
+    IMS_UNREGISTERED,
+    IMS_REGISTERED,
+  }
+
+  /**
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+  export enum ImsRegTech {
+    REGISTRATION_TECH_NONE,
+    REGISTRATION_TECH_LTE,
+    REGISTRATION_TECH_IWLAN,
+    REGISTRATION_TECH_NR,
+  }
+
+  /**
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+  export interface ImsRegInfo {
+    imsRegState: ImsRegState;
+    imsRegTech: ImsRegTech;
+  }
+
+  /**
+   * @systemapi Hide this for inner system use.
+   * @since 9
+   */
+  export enum ImsServiceType {
+    TYPE_VOICE,
+    TYPE_VIDEO,
+    TYPE_UT,
+    TYPE_SMS,
+  }
 }
 
 export default radio;
diff --git a/api/@ohos.telephony.sim.d.ts b/api/@ohos.telephony.sim.d.ts
index 475772a1af5de4499f2b86a86c88e9b4691d002a..7e3d87ff684255067e2e99fea96f472741cf0da1 100644
--- a/api/@ohos.telephony.sim.d.ts
+++ b/api/@ohos.telephony.sim.d.ts
@@ -434,7 +434,7 @@ declare namespace sim {
    *
    * @param slotId Indicates the card slot index number,
    * ranging from 0 to the maximum card slot index number supported by the device.
-   * @return Returns the opkey; returns "-1" if no SIM card is inserted or
+   * @return Returns the opkey; returns an empty string if no SIM card is inserted or
    * no opkey matched.
    * @since 9
    */
@@ -446,7 +446,7 @@ declare namespace sim {
     *
     * @param slotId Indicates the card slot index number,
     * ranging from 0 to the maximum card slot index number supported by the device.
-    * @return Returns the opname; returns null if no SIM card is inserted or
+    * @return Returns the opname; returns an empty string if no SIM card is inserted or
     * no opname matched.
     * @since 9
     */