diff --git a/api/@ohos.util.d.ts b/api/@ohos.util.d.ts
index a46db2c3e72eb067ef174f71cf47406543cdf3c8..93aee728c88f0c1b831e565dacb5a778366da3ad 100644
--- a/api/@ohos.util.d.ts
+++ b/api/@ohos.util.d.ts
@@ -126,6 +126,15 @@ declare namespace util {
          * @return return decoded text
          */
         decode(input: Uint8Array, options?: { stream?: false }): string;
+
+        /**
+         * Returns the result of running encoding's decoder.
+         * @since 9
+         * @syscap SystemCapability.Utils.Lang
+         * @param input decoded numbers in accordance with the format
+         * @return return decoded text
+         */
+         decodeWithStream(input: Uint8Array, options?: { stream?: boolean }): string;
     }
 
     class TextEncoder {