diff --git a/composer.json b/composer.json
index ce36498..9693859 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "tansilu/hfpay-lib",
-  "version": "0.0.3",
+  "version": "0.0.4",
   "type": "library",
   "require": {
     "php": ">=7.4",
diff --git a/src/factory/object/trade/UnifiedOrderRequest.php b/src/factory/object/trade/UnifiedOrderRequest.php
index fab481e..a54e186 100644
--- a/src/factory/object/trade/UnifiedOrderRequest.php
+++ b/src/factory/object/trade/UnifiedOrderRequest.php
@@ -106,6 +106,7 @@ class UnifiedOrderRequest
         if(empty($this->data['trans_amt'])) {
             throw new ParamsException('交易金额不能为空', 'trans_amt');
         }
+        $params['trans_amt'] = $this->data['trans_amt'];
         if(!empty($this->data['order_expire_time'])) {
             $params['order_expire_time'] = $this->data['order_expire_time'];
         }