diff --git a/app/Http/Controllers/SetupController.php b/app/Http/Controllers/SetupController.php
index f9fa74b2..76363a20 100644
--- a/app/Http/Controllers/SetupController.php
+++ b/app/Http/Controllers/SetupController.php
@@ -32,6 +32,19 @@ class SetupController extends Controller
 
     public function info()
     {
+        $existingTables = static::checkTablesExist([], true);
+
+        // Not installed completely
+        if (count($existingTables) > 0) {
+            Log::info('Remaining tables detected, exit setup wizard now', [$existingTables]);
+
+            $existingTables = array_map(function ($item) {
+                return get_db_config()['prefix'].$item;
+            }, $existingTables);
+
+            throw new PrettyPageException(trans('setup.database.table-already-exists', ['tables' => json_encode($existingTables)]), 1);
+        }
+
         return view('setup.wizard.info');
     }
 
@@ -60,7 +73,7 @@ class SetupController extends Controller
             }
         }
 
-        // create tables
+        // Create tables
         Artisan::call('migrate', ['--force' => true]);
         Log::info("[SetupWizard] Tables migrated.");
 
@@ -169,28 +182,24 @@ class SetupController extends Controller
      * Check if the given tables exist in current database.
      *
      * @param  array $tables
-     * @return bool
+     * @param  bool  $returnExisting
+     * @return bool|array
      */
-    public static function checkTablesExist($tables = null) {
-        $totalTables = 0;
-
+    public static function checkTablesExist($tables = [], $returnExistingTables = false) {
+        $existingTables = [];
         $tables = $tables ?: ['users', 'closets', 'players', 'textures', 'options'];
 
         foreach ($tables as $tableName) {
             // Table prefix will be added automatically
             if (Schema::hasTable($tableName)) {
-                $totalTables++;
+                $existingTables[] = $tableName;
             }
         }
 
-        if ($totalTables == count($tables)) {
+        if (count($existingTables) == count($tables)) {
             return true;
         } else {
-            // Not installed completely
-            foreach (array_merge($tables, ['migrations']) as $tableName) {
-                Schema::dropIfExists($tableName);
-            }
-            return false;
+            return $returnExistingTables ? $existingTables : false;
         }
     }
 
diff --git a/resources/lang/en/setup.yml b/resources/lang/en/setup.yml
index ba0d21b8..0e63e196 100644
--- a/resources/lang/en/setup.yml
+++ b/resources/lang/en/setup.yml
@@ -1,6 +1,7 @@
 database:
   connection-error: "Unable to connect to the target :type database, please check your configuration. The server replied with: :msg"
   connection-success: Connect to the target :type database [:server] successfully, just click NEXT to start installation.
+  table-already-exists: There are some tables already exist in target database, which names conflict with ones we are going to create. To avoid data loss, please manually delete these tables :tables, or set a different table prefix.
 
 file:
   permission-error: Unable to create textures folder, please check the directory permissions or place one manually.
diff --git a/resources/lang/zh_CN/setup.yml b/resources/lang/zh_CN/setup.yml
index 88b8cb85..aaa10f6e 100644
--- a/resources/lang/zh_CN/setup.yml
+++ b/resources/lang/zh_CN/setup.yml
@@ -1,6 +1,7 @@
 database:
   connection-error: 无法连接至 :type 服务器，请检查你的配置。服务器返回的信息：「:msg」
   connection-success: 成功连接至 :type 服务器 [:server] ，点击下一步以开始安装。
+  table-already-exists: 检测到目标数据库中已存在如下数据表 :tables，它们与本程序即将创建的数据表名称冲突，为了避免原有数据被覆盖，请手动删除它们，或者为本程序选择一个不同的数据表前缀。
 
 file:
   permission-error: textures 文件夹创建失败，请确认目录权限是否正确，或者手动放置一个。