diff --git a/anser.php b/anser.php
index 9691214..dca756f 100644
--- a/anser.php
+++ b/anser.php
@@ -59,7 +59,7 @@
           <div class="nav-wrapper container">
           <div style="text-align:center;display:inline-block;padding:5px 0;width:100%;float:left;">本次答题结束<span name="remtime">
             <?php
-              $con=mysqli_connect("172.27.16.2:3306","root","lxo329123456","buptStudent");
+              $con=mysqli_connect("127.0.0.1:3306","buptStudent","buptStudentlx","buptStudentdb");
               if (!$con){echo 'Could not connect:' . mysql_error();};
               $result2 = mysqli_fetch_array(mysqli_query($con,"SELECT * FROM UserAnswer WHERE Student_ID = '$_SESSION[Student_ID]'"));
               if($result2[score]) echo "得分为: ".$result2[score]*5." ";
@@ -80,7 +80,7 @@
       <div class="row">
             <?php
             //link to mysql
-            $con=mysqli_connect("172.27.16.2:3306","root","lxo329123456","buptStudent");
+            $con=mysqli_connect("127.0.0.1:3306","buptStudent","buptStudentlx","buptStudentdb");
             if (!$con){echo 'Could not connect:' . mysql_error();};
             //mysql_select_db("my_db_test", $con);
             $p = 20;
diff --git a/index.php b/index.php
index 3b9af40..3220b17 100644
--- a/index.php
+++ b/index.php
@@ -118,7 +118,7 @@ if($_SESSION[Student_ID] != ""){
           </div>
           <?php
             //link to mysql
-            $con=mysqli_connect("172.27.16.2:3306","root","lxo329123456","buptStudent");
+            $con=mysqli_connect("127.0.0.1:3306","buptStudent","buptStudentlx","buptStudentdb");
             if (!$con){die('Could not connect:' . mysql_error());};
             //mysql_select_db("my_db_test", $con);
             $p = 20;
@@ -151,6 +151,7 @@ if($_SESSION[Student_ID] != ""){
               }
               if($flag == 0){
                 $i--;
+                sleep(0.5);
               }
             }
 
diff --git a/test.php b/test.php
index 5d43842..b8a1720 100644
--- a/test.php
+++ b/test.php
@@ -8,7 +8,7 @@
     $m = floor($sec/60);
     $s = floor($sec%60);
     //link to mysql
-    $con=mysqli_connect("172.27.16.2:3306","root","lxo329123456","buptStudent");
+    $con=mysqli_connect("127.0.0.1:3306","buptStudent","buptStudentlx","buptStudentdb");
     if (!$con){die('Could not connect: '.mysql_error());}
     //mysql_select_db("my_db_test", $con);
     //name & student_id