diff --git a/api/signin/index.php b/api/signin/index.php
index 2ddbe35..a15e89c 100644
--- a/api/signin/index.php
+++ b/api/signin/index.php
@@ -19,12 +19,34 @@ if ($key == $setting['Key']) {
     if ($type == 'normal') {
         if (!empty($studentID)) {
             mysqli_query($conn,"LOCK TABLE ".$setting['SQL_DATA']['signin']." WRITE");
-            if (mysqli_query($conn,"UPDATE ".$setting['SQL_DATA']['signin']." SET signin_20220911='TRUE',time_20220911='$time' WHERE studentID='$studentID'")) {
+            $result_person = mysqli_query($conn,"SELECT * FROM ".$setting['SQL_DATA']['signin']." WHERE studentID=$studentID");
+            $result_person_object = mysqli_fetch_object($result_person);
+            if (empty($result_person_object->signin_20220911)) {
+                if (mysqli_query($conn,"UPDATE ".$setting['SQL_DATA']['signin']." SET signin_20220911='TRUE',time_20220911='$time' WHERE studentID='$studentID'")) {
+                    // 编译数据
+                    $data = array(
+                        'output'=>'SUCCESS',
+                        'code'=>200,
+                        'info'=>'已签到',
+                    );
+                    // 输出数据
+                    echo json_encode($data,JSON_UNESCAPED_UNICODE);
+                } else {
+                    // 编译数据
+                    $data = array(
+                        'output'=>'ERROR',
+                        'code'=>200,
+                        'info'=>'签到失败，数据库错误',
+                    );
+                    // 输出数据
+                    echo json_encode($data,JSON_UNESCAPED_UNICODE);
+                }
+            } else {
                 // 编译数据
                 $data = array(
-                    'output'=>'SUCCESS',
+                    'output'=>'ALREADY_SIGNIN',
                     'code'=>200,
-                    'info'=>'已签到',
+                    'info'=>'您已签到过了！',
                 );
                 // 输出数据
                 echo json_encode($data,JSON_UNESCAPED_UNICODE);
diff --git a/signin/20220911.php b/signin/20220911.php
index d809771..71a631a 100644
--- a/signin/20220911.php
+++ b/signin/20220911.php
@@ -45,7 +45,7 @@ $menu_page = 8;
                         <div class="row text-center">
                             <div class="col-12 fs-5 fw-bold mb-3">军训服装集合领取签到</div>
                             <?PHP
-                            if ($_COOKIE['studentID'] = '22344233' or $_COOKIE['studentID'] = '22344231' or $_COOKIE['studentID'] = '22344218' or $_COOKIE['studentID'] = '22344219' or $_COOKIE['studentID'] = '22344216') {
+                            if ($_COOKIE['studentID'] == '22344233' or $_COOKIE['studentID'] == '22344231' or $_COOKIE['studentID'] == '22344218' or $_COOKIE['studentID'] == '22344219' or $_COOKIE['studentID'] == '22344216') {
                             ?>
                             <div class="col-12 my-3">查询到场人 <a class="btn btn-danger" href="./admin_20220911.php" role="button">查询</a></div>
                             <?PHP
diff --git a/signin/upload/20220911.php b/signin/upload/20220911.php
index 5397bda..8882319 100644
--- a/signin/upload/20220911.php
+++ b/signin/upload/20220911.php
@@ -37,6 +37,27 @@ if (!empty($studentID)) {
                 window.history.go(-1);
             </script>
             EOF;
+    } elseif ($signin['output'] == 'ALREADY_SIGNIN') {
+        echo <<<EOF
+            <script language="javascript">
+                alert( "您已签到过了" )
+                window.history.go(-1);
+            </script>
+            EOF;
+    } elseif ($signin['output'] == 'USER_NONE') {
+        echo <<<EOF
+            <script language="javascript">
+                alert( "缺少用户信息" )
+                window.history.go(-1);
+            </script>
+            EOF;
+    } elseif ($signin['output'] == 'ERROR') {
+        echo <<<EOF
+            <script language="javascript">
+                alert( "数据库错误" )
+                window.history.go(-1);
+            </script>
+            EOF;
     } else {
         echo <<<EOF
             <script language="javascript">