diff --git a/doitphp/core/Configure.class.php b/doitphp/core/Configure.class.php
index fb48792..4649eac 100644
--- a/doitphp/core/Configure.class.php
+++ b/doitphp/core/Configure.class.php
@@ -15,6 +15,8 @@
     exit();
 }
 
+define('CONFIG_DIR', APP_ROOT . 'application/config/');
+
 abstract class Configure {
 
     /*
@@ -265,4 +267,4 @@ private static function _getDefaultConfig() {
 
         return $defaultConfig;
     }
-}
\ No newline at end of file
+}
diff --git a/doitphp/core/Controller.class.php b/doitphp/core/Controller.class.php
index 905e18c..791b781 100644
--- a/doitphp/core/Controller.class.php
+++ b/doitphp/core/Controller.class.php
@@ -699,7 +699,11 @@ protected static function _stripSlashes($data = array()) {
             return stripslashes($data);
         }
 
-        return array_map(array($this, '_stripSlashes'), $data);
+        foreach($data as &$_val){
+            $_val = stripcslashes($_val);
+        }
+
+        return $data;
     }
 
     /**
@@ -798,4 +802,4 @@ public function __call($method, $args) {
                 $this->halt('The method: ' . $method . '() is not found in ' . get_class($this) . ' class!', 'Normal');
         }
     }
-}
\ No newline at end of file
+}
diff --git a/doitphp/core/Model.class.php b/doitphp/core/Model.class.php
index e047f64..c09c022 100644
--- a/doitphp/core/Model.class.php
+++ b/doitphp/core/Model.class.php
@@ -1061,7 +1061,7 @@ protected function _parseLimit($startId = null, $listNum = null) {
             }
         }
 
-        $limitString = "LIMIT" . (($listNum) ? "{$startId},{$listNum}" : $startId);
+        $limitString = "LIMIT " . (($listNum) ? "{$startId},{$listNum}" : $startId);
 
         return $limitString;
     }
@@ -1674,4 +1674,4 @@ public static function getInstance() {
 
         return self::$_instance;
     }
-}
\ No newline at end of file
+}
diff --git a/doitphp/library/Check.class.php b/doitphp/library/Check.class.php
index 99db7c3..a9281da 100644
--- a/doitphp/library/Check.class.php
+++ b/doitphp/library/Check.class.php
@@ -171,10 +171,10 @@ public static function isMust($string = null) {
 
         //参数分析
         if (is_null($string)) {
-            return false;
+            return true;
         }
 
-        return is_null($string) ? false : true;
+        return is_null($string) ? true : false;
     }
 
     /**
@@ -196,4 +196,4 @@ public static function isLength($string = null, $min = 0, $max = 255) {
 
         return (($length >= (int)$min) && ($length <= (int)$max)) ? true : false;
     }
-}
\ No newline at end of file
+}