diff --git a/ts/src/client.ts b/ts/src/client.ts
index 03421a9..ef90952 100644
--- a/ts/src/client.ts
+++ b/ts/src/client.ts
@@ -690,6 +690,7 @@ export default class Client {
         request_.pathname = pathname;
         request_.headers = {
           'user-agent': this.getUserAgent(),
+          'Content-Type': 'application/json',
           Date: OpenSearchUtil.getDate(),
           host: Util.defaultString(this._endpoint, `opensearch-cn-hangzhou.aliyuncs.com`),
           'X-Opensearch-Nonce': Util.getNonce(),
diff --git a/util/ts/package.json b/util/ts/package.json
index 801b126..48ee14a 100644
--- a/util/ts/package.json
+++ b/util/ts/package.json
@@ -19,8 +19,7 @@
     "typescript": "^3.7.5"
   },
   "dependencies": {
-    "@alicloud/tea-typescript": "latest",
-    "moment": "^2.27.0"
+    "@alicloud/tea-typescript": "latest"
   },
   "files": [
     "dist",
diff --git a/util/ts/src/client.ts b/util/ts/src/client.ts
index 3c46266..658fd9d 100644
--- a/util/ts/src/client.ts
+++ b/util/ts/src/client.ts
@@ -3,7 +3,6 @@
  * This module used for OpenSearch SDK
  */
 import * as $tea from '@alicloud/tea-typescript';
-import moment from 'moment';
 import crypto from 'crypto';
 
 function getSignedStr(request: $tea.Request, resource: string, accessKeySecret: string): string {
@@ -36,20 +35,20 @@ function getSignedStr(request: $tea.Request, resource: string, accessKeySecret:
 
 function getSignature(request: $tea.Request, accessKeySecret: string): string {
   let resource = request.pathname;
-  const keys = Object.keys(request.query);
-  if (resource.indexOf('?') === -1 && keys.length > 0) {
-    resource += '?';
+  const params = Object
+    .entries<string>(request.query)
+    .filter(([, value]) => typeof value !== "undefined" && value !== null)
+    .map(([key, value]) => {
+      let valueStr = encodeURIComponent(value);
+      valueStr = valueStr.replace(/'/g, "%27");
+      return `${key}=${valueStr}`;
+    });
+
+  if (params.length) {
+    resource += `?${params.join("&")}`;
   }
-  keys.forEach(key => {
-    let value = request.query[key];
-    if (typeof value === 'undefined' || value === null) {
-      return;
-    }
-    let valueStr = encodeURIComponent(value);
-    valueStr = valueStr.replace(/'/g, '%27');
-    resource += `${key}=${valueStr}&`;
-  })
-  return getSignedStr(request, resource.slice(0, -1), accessKeySecret)
+
+  return getSignedStr(request, resource, accessKeySecret)
 }
 
 
@@ -92,7 +91,7 @@ export default class Client {
    * @return date string
    */
   static getDate(): string {
-    return moment().format('YYYY-MM-DDTHH:mm:ss\\Z');
+    return new Date().toISOString().replace(/\.\d+/,'');
   }
 
   /**