diff --git a/api/@ohos.geolocation.d.ts b/api/@ohos.geolocation.d.ts
index 13d87e726d3e111d54abef61a805f9222880787e..d8a755e11c027b7b3a0ae7f528d2da1609a0cc62 100644
--- a/api/@ohos.geolocation.d.ts
+++ b/api/@ohos.geolocation.d.ts
@@ -149,6 +149,24 @@ declare namespace geolocation {
      */
     function off(type: 'fenceStatusChange', request: GeofenceRequest, want: WantAgent) : void;
 
+    /**
+     * registering the callback function for listening to country code changes.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @param callback Indicates the callback for reporting country code changes.
+     */
+    function on(type: 'countryCodeChange', callback: Callback<CountryCode>) : void;
+
+    /**
+     * unregistering the callback function for listening to country code changes.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @param callback Indicates the callback for reporting country code changes.
+     */
+    function off(type: 'countryCodeChange', callback?: Callback<CountryCode>) : void;
+
     /**
      * obtain current location
      *
@@ -286,6 +304,123 @@ declare namespace geolocation {
     function sendCommand(command: LocationCommand, callback: AsyncCallback<boolean>) : void;
     function sendCommand(command: LocationCommand) : Promise<boolean>;
 
+    /**
+     * obtain the current country code.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @param callback Indicates the callback for reporting the country code.
+     */
+    function getCountryCode(callback: AsyncCallback<CountryCode>) : void;
+    function getCountryCode() : Promise<CountryCode>;
+
+    /**
+     * enable the geographical location simulation function.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     * @param scenario Indicates the scenarios where location simulation is required.
+     * @param callback Indicates a callback function, which is used to report the result 
+     * of enabling the location simulation function. If the enabling fails, the error message will
+     * be carried in the first parameter err of AsyncCallback, If enabling succeeds, no data will be returned.
+     */
+    function enableLocationMock(scenario?: LocationRequestScenario, callback: AsyncCallback<void>) : void;
+    function enableLocationMock(scenario?: LocationRequestScenario) : Promise<void>;
+
+    /**
+     * disable the geographical location simulation function.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     * @param scenario Indicates the scenarios where location simulation is required.
+     * @param callback Indicates a callback function, which is used to report the result 
+     * of disabling the location simulation function. If the disabling fails, the error message will
+     * be carried in the first parameter err of AsyncCallback, If disabling succeeds, no data will be returned.
+     */
+    function disableLocationMock(scenario?: LocationRequestScenario, callback: AsyncCallback<void>) : void;
+    function disableLocationMock(scenario?: LocationRequestScenario) : Promise<void>;
+
+    /**
+     * set the configuration parameters for location simulation.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     * @param config Indicates the configuration parameters for location simulation.
+     * @param callback Indicates a callback function, which is used to report the result of setting 
+     * the simulation locations. If the setting fails, the error message will be carried in the first 
+     * parameter err of AsyncCallback. If the setting succeeds, no data will be returned.
+     */
+    function setMockedLocations(config: LocationMockConfig, callback: AsyncCallback<void>) : void;
+    function setMockedLocations(config: LocationMockConfig) : Promise<void>;
+
+    /**
+     * enable the reverse geocoding simulation function.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     * @param callback Indicates a callback function, which is used to report the result 
+     * of enabling the reverse geocode simulation function. If the enabling fails, the error message will
+     * be carried in the first parameter err of AsyncCallback, If enabling succeeds, no data will be returned.
+     */
+    function enableReverseGeocodingMock(callback: AsyncCallback<void>) : void;
+    function enableReverseGeocodingMock() : Promise<void>;
+
+    /**
+     * disable the reverse geocoding simulation function.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     * @param callback Indicates a callback function, which is used to report the result 
+     * of disabling the reverse geocode simulation function. If the disabling fails, the error message will
+     * be carried in the first parameter err of AsyncCallback, If disabling succeeds, no data will be returned.
+     */
+    function disableReverseGeocodingMock(callback: AsyncCallback<void>) : void;
+    function disableReverseGeocodingMock() : Promise<void>;
+
+    /**
+     * set the configuration parameters for simulating reverse geocoding.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     * @param mockInfos Indicates the set of locations and place names to be simulated.
+     * @param callback Indicates a callback function, which is used to report the result of setting 
+     * the configuration parameters for simulating reverse geocoding. If the setting fails, 
+     * the error message will be carried in the first parameter err of AsyncCallback. 
+     * If the setting succeeds, no data will be returned.
+     */
+    function setReverseGeocodingMockInfo(mockInfos: Array<ReverseGeocodingMockInfo>, callback: AsyncCallback<void>) : void;
+    function setReverseGeocodingMockInfo(mockInfos: Array<ReverseGeocodingMockInfo>) : Promise<void>;
+
+    /**
+     * configuration parameters for simulating reverse geocoding.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     */
+    export interface ReverseGeocodingMockInfo {
+        location: ReverseGeoCodeRequest;
+        geoAddress: GeoAddress;
+    }
+
+    /**
+     * parameters for configuring the location simulation function.
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     * @systemapi
+     */
+    export interface LocationMockConfig {
+        timeInterval: number;
+        locations: Array<Location>;
+    }
+
     /**
      * satellite status information
      *
@@ -407,24 +542,124 @@ declare namespace geolocation {
      * @permission ohos.permission.LOCATION
      */
     export interface GeoAddress {
+        /**
+         * Indicates latitude information.
+         * A positive value indicates north latitude,
+         * and a negative value indicates south latitude.
+         * @since 7
+         */
         latitude?: number;
+
+        /**
+         * Indicates longitude information.
+         * A positive value indicates east longitude ,
+         * and a negative value indicates west longitude .
+         * @since 7
+         */
         longitude?: number;
+
+        /**
+         * Indicates language used for the location description.
+         * zh indicates Chinese, and en indicates English.
+         * @since 7
+         */
         locale?: string;
+
+        /**
+         * Indicates landmark of the location.
+         * @since 7
+         */
         placeName?: string;
+
+        /**
+         * Indicates country code.
+         * @since 7
+         */
         countryCode?: string;
+
+        /**
+         * Indicates country name.
+         * @since 7
+         */
         countryName?: string;
+
+        /**
+         * Indicates administrative region name.
+         * @since 7
+         */
         administrativeArea?: string;
+
+        /**
+         * Indicates sub-administrative region name.
+         * @since 7
+         */
         subAdministrativeArea?: string;
+
+        /**
+         * Indicates locality information.
+         * @since 7
+         */
         locality?: string;
+
+        /**
+         * Indicates sub-locality information.
+         * @since 7
+         */
         subLocality?: string;
+
+        /**
+         * Indicates road name.
+         * @since 7
+         */
         roadName?: string;
+
+        /**
+         * Indicates auxiliary road information.
+         * @since 7
+         */
         subRoadName?: string;
+
+        /**
+         * Indicates house information.
+         * @since 7
+         */
         premises?: string;
+
+        /**
+         * Indicates postal code.
+         * @since 7
+         */
         postalCode?: string;
+
+        /**
+         * Indicates phone number.
+         * @since 7
+         */
         phoneNumber?: string;
+
+        /**
+         * Indicates website URL.
+         * @since 7
+         */
         addressUrl?: string;
+
+        /**
+         * Indicates additional information.
+         * @since 7
+         */
         descriptions?: Array<string>;
+
+        /**
+         * Indicates the amount of additional descriptive information.
+         * @since 7
+         */
         descriptionsSize?: number;
+
+        /**
+         * Indicates whether it is an mock GeoAddress
+         * @since 9
+         */
+        isFromMock: Boolean;
     }
 
     /**
@@ -464,16 +699,75 @@ declare namespace geolocation {
      * @permission ohos.permission.LOCATION
      */
     export interface Location {
+        /**
+         * Indicates latitude information.
+         * A positive value indicates north latitude,
+         * and a negative value indicates south latitude.
+         * @since 7
+         */
         latitude: number;
+
+        /**
+         * Indicates Longitude information.
+         * A positive value indicates east longitude ,
+         * and a negative value indicates west longitude .
+         * @since 7
+         */
         longitude: number;
+
+        /**
+         * Indicates location altitude, in meters.
+         * @since 7
+         */
         altitude: number;
+
+        /**
+         * Indicates location accuracy, in meters.
+         * @since 7
+         */
         accuracy: number;
+
+        /**
+         * Indicates speed, in m/s.
+         * @since 7
+         */
         speed: number;
+
+        /**
+         * Indicates location timestamp in the UTC format.
+         * @since 7
+         */
         timeStamp: number;
+
+        /**
+         * Indicates direction information.
+         * @since 7
+         */
         direction: number;
+
+        /**
+         * Indicates location timestamp since boot.
+         * @since 7
+         */
         timeSinceBoot: number;
+
+        /**
+         * Indicates additional information.
+         * @since 7
+         */
         additions?: Array<string>;
+
+        /**
+         * Indicates the amount of additional descriptive information.
+         * @since 7
+         */
         additionSize?: number;
+
+        /**
+         * Indicates whether it is an mock location.
+         * @since 9
+         */
+        isFromMock: Boolean;
     }
 
     /**
@@ -514,13 +808,59 @@ declare namespace geolocation {
      * @permission ohos.permission.LOCATION
      */
     export enum GeoLocationErrorCode {
-        INPUT_PARAMS_ERROR = 101,
+        /**
+         * Indicates function not supported.
+         * @since 9
+         */
+        NOT_SUPPORTED = 100,
+
+        /**
+         * Indicates input parameter error.
+         * @since 7
+         */
+        INPUT_PARAMS_ERROR,
+
+        /**
+         * Indicates reverse geocode query failed.
+         * @since 7
+         */
         REVERSE_GEOCODE_ERROR,
+
+        /**
+         * Indicates geocode query failed.
+         * @since 7
+         */
         GEOCODE_ERROR,
+
+        /**
+         * Indicates positioning failed.
+         * @since 7
+         */
         LOCATOR_ERROR,
+
+        /**
+         * Indicates operation failure caused by abnormal location switch.
+         * @since 7
+         */
         LOCATION_SWITCH_ERROR,
+
+        /**
+         * Indicates failed to get the last known location.
+         * @since 7
+         */
         LAST_KNOWN_LOCATION_ERROR,
+
+        /**
+         * Indicates location request timeout.
+         * @since 7
+         */
         LOCATION_REQUEST_TIMEOUT_ERROR,
+
+        /**
+         * Indicates country code query failed.
+         * @since 9
+         */
+        QUERY_COUNTRY_CODE_ERROR,
     }
 
     /**
@@ -547,6 +887,30 @@ declare namespace geolocation {
         scenario: LocationRequestScenario;
         command: string;
     }
+
+    /**
+     * country code structure
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     */
+    export interface CountryCode {
+        country: string;
+        type: CountryCodeType;
+    }
+
+    /**
+     * enum for country code type
+     *
+     * @since 9
+     * @syscap SystemCapability.Location.Location.Core
+     */
+    export enum CountryCodeType {
+        COUNTRY_CODE_FROM_LOCALE = 1,
+        COUNTRY_CODE_FROM_SIM,
+        COUNTRY_CODE_FROM_LOCATION,
+        COUNTRY_CODE_FROM_NETWORK,
+    }
 }
 
-export default geolocation;
\ No newline at end of file
+export default geolocation;