diff --git a/lib/src/exception/Exception.dart b/lib/src/exception/Exception.dart
index 5f20347..f145428 100644
--- a/lib/src/exception/Exception.dart
+++ b/lib/src/exception/Exception.dart
@@ -9,6 +9,7 @@ export 'package:Q/src/exception/MaxUploadSizeExceededException.dart';
 export 'package:Q/src/exception/NoMatchRequestResolverException.dart';
 export 'package:Q/src/exception/RedirectNotFoundException.dart';
 export 'package:Q/src/exception/RequestParamRequiredException.dart';
+export 'package:Q/src/exception/RequiredMethodNotFoundException.dart';
 export 'package:Q/src/exception/RouterNotFoundException.dart';
 export 'package:Q/src/exception/RouterNotFoundOfRouterChainException.dart';
 export 'package:Q/src/exception/SizeUnitParseException.dart';
diff --git a/lib/src/exception/RequiredMethodNotFoundException.dart b/lib/src/exception/RequiredMethodNotFoundException.dart
new file mode 100644
index 0000000..8b2bd81
--- /dev/null
+++ b/lib/src/exception/RequiredMethodNotFoundException.dart
@@ -0,0 +1,16 @@
+class RequiredMethodNotFoundException extends Exception {
+  factory RequiredMethodNotFoundException({String message, String name}) => _RequiredMethodNotFoundException(message: message, name: name);
+}
+
+class _RequiredMethodNotFoundException implements RequiredMethodNotFoundException {
+  final message;
+
+  final String name;
+
+  _RequiredMethodNotFoundException({this.message, this.name});
+
+  String toString() {
+    if (message == null) return "Exception: required method not found: '${this.name}'";
+    return "Exception: $message";
+  }
+}
diff --git a/lib/src/helpers/reflect/ClassTransformer.dart b/lib/src/helpers/reflect/ClassTransformer.dart
index bfc563d..7d83c4e 100644
--- a/lib/src/helpers/reflect/ClassTransformer.dart
+++ b/lib/src/helpers/reflect/ClassTransformer.dart
@@ -1,20 +1,34 @@
 import 'dart:mirrors';
 
+import 'package:Q/Q.dart';
+import 'package:Q/src/utils/SymbolUtil.dart';
+
 class ClassTransformer {
+  static String MODEL_METHOD = '_model';
+
   // TODO reflect _.model method
   static dynamic fromMap(Map data, Type clazz) async {
     ClassMirror classMirror = reflectClass(clazz);
     Map<Symbol, DeclarationMirror> declarations = classMirror.declarations;
-    InstanceMirror instanceMirror = classMirror.newInstance(Symbol.empty, []);
+    Symbol MODEL_METHOD_SYMBOL = Symbol('${SymbolUtil.toChars(classMirror.simpleName)}.${MODEL_METHOD}');
+    if (!declarations.keys.map((Symbol key) {
+      return key.toString();
+    }).contains(MODEL_METHOD_SYMBOL.toString())) {
+      throw RequiredMethodNotFoundException(name: MODEL_METHOD_SYMBOL.toString());
+    }
+    // why method parameters is null
+    MethodMirror modelMethodMirror;
+    for (Symbol key in declarations.keys) {
+      if (key.toString().endsWith(MODEL_METHOD_SYMBOL.toString())) {
+        modelMethodMirror = declarations[key];
+      }
+    }
+    List positionalArguments = List();
+    InstanceMirror instanceMirror = classMirror.newInstance(MODEL_METHOD_SYMBOL, []);
     for (var key in data.keys) {
       dynamic value = data[key];
       ClassMirror valueMirror = reflect(value).type;
       Symbol fieldName = Symbol(key);
-      // check field name
-      if (declarations.containsKey(fieldName)) {
-        // check field type
-        instanceMirror.setField(fieldName, value);
-      }
     }
     return instanceMirror.reflectee;
   }
diff --git a/lib/src/utils/SymbolUtil.dart b/lib/src/utils/SymbolUtil.dart
new file mode 100644
index 0000000..239dea2
--- /dev/null
+++ b/lib/src/utils/SymbolUtil.dart
@@ -0,0 +1,7 @@
+class SymbolUtil {
+  static toChars(Symbol symbol) {
+    String str = symbol.toString();
+    str = str.replaceRange(str.length - 2, str.length, '');
+    return str.replaceRange(0, 8, '');
+  }
+}