diff --git a/api/@ohos.i18n.d.ts b/api/@ohos.i18n.d.ts
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+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provides international settings related APIs.
+ *
+ * @since 7
+ * @devices phone, table, tv, wearable, car
+ */
+declare namespace i18n {
+/**
+ * Obtains the country or region name localized for display on a given locale.
+ *
+ * @param country The locale whose country or region name will be displayed.
+ * @param locale The locale used to display the country or region.
+ * @param sentenceCase Specifies whether the country or region name is displayed in sentence case.
+ * @return Returns the country or region name localized for display on a given locale.
+ * @since 7
+ */
+export function getDisplayCountry(country: string, locale: string, sentenceCase?: boolean): string;
+
+/**
+ * Obtains the language name localized for display on a given locale.
+ *
+ * @param language The locale whose language name will be displayed.
+ * @param locale The locale used to display the language.
+ * @param sentenceCase Specifies whether the language name is displayed in sentence case.
+ * @return Returns the language name localized for display on a given locale.
+ * @since 7
+ */
+export function getDisplayLanguage(language: string, locale: string, sentenceCase?: boolean): string;
+
+/**
+ * Obtain all regions supported by the system.
+ *
+ * @return Returns all languages supported by the system.
+ * @since 7
+ * @systemapi Hide this for inner system use.
+ */
+export function getSystemLanguages(): Array<string>;
+
+/**
+ * Obtain all regions supported by the system in the language.
+ *
+ * @param language The language used to get the list of regions.
+ * @return Returns all regions supported by the system in the language.
+ * @since 7
+ * @systemapi Hide this for inner system use.
+ */
+export function getSystemCountries(language: string): Array<string>;
+
+/**
+ * Determine whether the current language or region is recommended.
+ *
+ * @param language The language code.
+ * @param region The region code.
+ * @return Returns whether the current language or region is recommended.
+ * @since 7
+ * @systemapi Hide this for inner system use.
+ */
+export function isSuggested(language: string, region?: string): boolean;
+
+/**
+ * Obtain the language currently used by the system.
+ *
+ * @return Returns the language currently used by the system.
+ * @since 7
+ */
+export function getSystemLanguage(): string;
+
+/**
+ * Set the language currently used by the system.
+ *
+ * @param language The language to be used.
+ * @since 7
+ * @systemapi Hide this for inner system use.
+ */
+export function setSystemLanguage(language: string): boolean;
+
+/**
+ * Obtain the region currently used by the system.
+ *
+ * @return Returns the region currently used by the system.
+ * @since 7
+ */
+export function getSystemRegion(): string;
+
+/**
+ * Set the region currently used by the system.
+ *
+ * @param region The region to be used.
+ * @since 7
+ * @systemapi Hide this for inner system use.
+ */
+export function setSystemRegion(region: string): boolean;
+
+/**
+ * Obtain the locale currently used by the system.
+ *
+ * @return Returns the locale currently used by the system.
+ * @since 7
+ */
+export function getSystemLocale(): string;
+
+/**
+ * Set the locale currently used by the system.
+ *
+ * @param locale The locale to be used.
+ * @since 7
+ * @systemapi Hide this for inner system use.
+ */
+export function setSystemLocale(locale: string): boolean;
+}
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