diff --git a/api/@ohos.i18n.d.ts b/api/@ohos.i18n.d.ts
index 3001b54bd872b1acad1bd2aa1e3103b793207dc4..9151c84d22042920ceef3cd57191c4885b17a9b9 100644
--- a/api/@ohos.i18n.d.ts
+++ b/api/@ohos.i18n.d.ts
@@ -123,6 +123,41 @@ export function getSystemLocale(): string;
  */
 export function setSystemLocale(locale: string): boolean;
 
+/**
+ * Provides util functions.
+ *
+ * @since 8
+ */
+export interface Util {
+    /**
+     * Convert from unit to to unit and format according to the locale.
+     * @param fromUnit Information of the unit to be converted.
+     * @param toUnit Information about the unit to be converted to.
+     * @param value Indicates the number to be formatted.
+     * @param locale The locale to be used.
+     * @param style The style of format.
+     * @since 8
+     */
+    unitConvert(fromUnit: UnitInfo, toUnit: UnitInfo, value: number, locale: string, style?: string): string;
+}
+
+/**
+ * Provides the options of unit.
+ *
+ * @since 8
+ */
+export interface UnitInfo {
+    /**
+     * Unit name.
+     */
+    unit: string
+
+    /**
+     * The measurement system of the unit.
+     */
+    measureSystem: string
+}
+
 /**
  * Provides the options of PhoneNumberFormat.
  *
diff --git a/api/@ohos.intl.d.ts b/api/@ohos.intl.d.ts
index 5cfb03b1f0d49ab7ae4bd5229fdfbe44b18635b8..7d22699942624e18264526d31b0a0e60fefcc543 100755
--- a/api/@ohos.intl.d.ts
+++ b/api/@ohos.intl.d.ts
@@ -304,6 +304,11 @@ export interface NumberOptions {
      */
     unitDisplay: string
 
+    /**
+     * Indicates the unit display format.
+     */
+    unitUsage: string
+
     /**
      * Indicates the sign display format.
      */