diff --git a/java/Demo.java b/java/Demo.java
index 2c02f41..b3d1d18 100644
--- a/java/Demo.java
+++ b/java/Demo.java
@@ -28,7 +28,7 @@ public class Demo {
             body.put("AccessKey", ACCESS_KEY);
             System.out.println(post("/api/apiv1/open/withdrawal/querybalance", body));
         } else if ("submit".equals(cmd)) {
-            String orderNo = "OrderNo" + (System.currentTimeMillis() / 1000);
+            String orderNo = "DEMO" + new java.text.SimpleDateFormat("yyyyMMddHHmmss").format(new java.util.Date()) + String.format("%04d", new java.util.Random().nextInt(10000));
             Map<String, Object> body = new LinkedHashMap<>();
             body.put("Timestamp", System.currentTimeMillis() / 1000);
             body.put("AccessKey", ACCESS_KEY);
diff --git a/nodejs/demo.js b/nodejs/demo.js
index 41ad3da..de09d4d 100644
--- a/nodejs/demo.js
+++ b/nodejs/demo.js
@@ -29,7 +29,7 @@ async function main() {
       AccessKey: ACCESS_KEY,
     }), null, 2));
   } else if (cmd === 'submit') {
-    const OrderNo = `OrderNo${Math.floor(Date.now() / 1000)}`;
+    const OrderNo = `DEMO${new Date().toISOString().replace(/[-:TZ.]/g, '').slice(0, 14)}${String(Math.floor(Math.random() * 10000)).padStart(4, '0')}`;
     console.log(JSON.stringify(await post('/api/apiv1/open/withdrawal/submit', {
       Timestamp: Math.floor(Date.now() / 1000),
       AccessKey: ACCESS_KEY,
diff --git a/php/demo.php b/php/demo.php
index e9f3c97..5f587c2 100644
--- a/php/demo.php
+++ b/php/demo.php
@@ -32,7 +32,7 @@ if ($cmd === 'balance') {
         'AccessKey' => $ACCESS_KEY,
     ]), JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT), PHP_EOL;
 } elseif ($cmd === 'submit') {
-    $orderNo = 'OrderNo' . time();
+    $orderNo = 'DEMO' . date('YmdHis') . sprintf('%04d', random_int(0, 9999));
     echo json_encode(post_json('/api/apiv1/open/withdrawal/submit', [
         'Timestamp' => time(),
         'AccessKey' => $ACCESS_KEY,
diff --git a/python/demo.py b/python/demo.py
index 36f26f8..b474eab 100644
--- a/python/demo.py
+++ b/python/demo.py
@@ -39,7 +39,7 @@ def cmd_balance() -> None:
 
 
 def cmd_submit() -> None:
-    order_no = f"OrderNo{int(time.time())}"
+    order_no = 'DEMO' + time.strftime('%Y%m%d%H%M%S') + f'{__import__("random").randint(0,9999):04d}'
     print(json.dumps(post("/api/apiv1/open/withdrawal/submit", {
         "Timestamp": int(time.time()),
         "AccessKey": ACCESS_KEY,