diff --git a/hertzbeat-common/src/main/java/org/apache/hertzbeat/common/util/AesUtil.java b/hertzbeat-common/src/main/java/org/apache/hertzbeat/common/util/AesUtil.java
index b5681aac8b..d9737394d9 100644
--- a/hertzbeat-common/src/main/java/org/apache/hertzbeat/common/util/AesUtil.java
+++ b/hertzbeat-common/src/main/java/org/apache/hertzbeat/common/util/AesUtil.java
@@ -90,7 +90,7 @@ public final class AesUtil {
             // encode content to byte array
             byte[] byteAes = cipher.doFinal(byteEncode);
             // base64 encode content
-            return new String(Base64.getEncoder().encode(byteAes), StandardCharsets.UTF_8);
+            return Base64.getEncoder().encodeToString(byteAes);
         } catch (Exception e) {
             log.error("aes encode content error: {}", e.getMessage(), e);
             return content;
diff --git a/hertzbeat-grafana/src/main/java/org/apache/hertzbeat/grafana/service/ServiceAccountService.java b/hertzbeat-grafana/src/main/java/org/apache/hertzbeat/grafana/service/ServiceAccountService.java
index cc504c1df7..bb0be32315 100644
--- a/hertzbeat-grafana/src/main/java/org/apache/hertzbeat/grafana/service/ServiceAccountService.java
+++ b/hertzbeat-grafana/src/main/java/org/apache/hertzbeat/grafana/service/ServiceAccountService.java
@@ -194,9 +194,9 @@ public class ServiceAccountService {
 
     private HttpHeaders createHeaders() {
         String auth = username + SignConstants.DOUBLE_MARK + password;
-        byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(StandardCharsets.UTF_8));
+        String encodedAuth = Base64.getEncoder().encodeToString(auth.getBytes(StandardCharsets.UTF_8));
         String authHeader = NetworkConstants.BASIC
-                + SignConstants.BLANK + new String(encodedAuth);
+                + SignConstants.BLANK + encodedAuth;
 
         HttpHeaders headers = new HttpHeaders();
         headers.setContentType(MediaType.APPLICATION_JSON);