diff --git a/app/controllers/pull_requests_controller.rb b/app/controllers/pull_requests_controller.rb
index edb383029..e95209033 100644
--- a/app/controllers/pull_requests_controller.rb
+++ b/app/controllers/pull_requests_controller.rb
@@ -333,11 +333,11 @@ class PullRequestsController < ApplicationController
       end
 
       pushTXInfo["shas"] = shas # 后续修改为shaList
-      pushTXInfoJson = pushTXInfo.to_json.to_s
+      pushTXInfoJson = pushTXInfo.to_json
       # 发送交易
       Rails.logger.info("before executing chain_trustie command...")
       Rails.logger.info(pushTXInfoJson)
-      cmd = "chain_trustie pushPRTX " + pushTXInfoJson
+      cmd = 'chain_trustie pushPRTX ' + pushTXInfoJson
       Rails.logger.info(cmd)
 
       # result = system  # 执行失败了