diff --git a/api/@ohos.app.form.formHost.d.ts b/api/@ohos.app.form.formHost.d.ts
index 824932e5a..82d4c0bde 100644
--- a/api/@ohos.app.form.formHost.d.ts
+++ b/api/@ohos.app.form.formHost.d.ts
@@ -32,6 +32,26 @@ import formInfo from './@ohos.app.form.formInfo';
  * @since 9
  */
 declare namespace formHost {
+  /**
+   * Add a form.
+   * <p>You can use this method to create a theme form.</p>
+   *
+   * @permission ohos.permission.REQUIRE_FORM
+   * @param { Want } want - Indicates want of the form.
+   * @returns { Promise<formInfo.RunningFormInfo> } Return the form info.
+   * @throws { BusinessError } 201 - Permissions denied.
+   * @throws { BusinessError } 202 - The application is not a system application.
+   * @throws { BusinessError } 401 - If the input parameter is not valid parameter.
+   * @throws { BusinessError } 16500050 - An IPC connection error happened.
+   * @throws { BusinessError } 16500060 - A service connection error happened, please try again later.
+   * @throws { BusinessError } 16501000 - An internal functional error occurred.
+   * @syscap SystemCapability.Ability.Form
+   * @systemapi
+   * @stagemodelonly
+   * @since 12
+   */
+  function addForm(want: Want): Promise<formInfo.RunningFormInfo>;
+
   /**
    * Deletes an obtained form by its ID.
    * <p>After this method is called, the form won't be available for use by the application and the Form Manager
diff --git a/api/@ohos.app.form.formInfo.d.ts b/api/@ohos.app.form.formInfo.d.ts
index c37d1aefa..c6f905eef 100644
--- a/api/@ohos.app.form.formInfo.d.ts
+++ b/api/@ohos.app.form.formInfo.d.ts
@@ -874,6 +874,20 @@ declare namespace formInfo {
      */
     ABILITY_NAME_KEY = 'ohos.extra.param.key.ability_name',
 
+    /**
+     * Indicates the key specifying whether a form type is theme, which is represented as
+     * want: {
+     *   "parameters": {
+     *       THEME_KEY: true
+     *    }
+     * }
+     *
+     * @syscap SystemCapability.Ability.Form
+     * @systemapi
+     * @since 12
+     */
+    THEME_KEY = 'ohos.extra.param.key.form_is_theme',
+
     /**
      * Indicates the key specifying the the device ID, which is represented as
      * want: {
@@ -1528,6 +1542,18 @@ declare namespace formInfo {
      * @since 11
      */
     readonly formDescription: string;
+
+    /**
+     * Obtains the extra data of the this form.
+     *
+     * @type { ?Record<string, Object> }
+     * @default -
+     * @readonly
+     * @syscap SystemCapability.Ability.Form
+     * @systemapi
+     * @since 12
+     */
+    readonly extraData?: Record<string, Object>;
   }
 
   /**