diff --git a/docs/changelog.rst b/docs/changelog.rst
index 8709df6..0c048dc 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,10 @@
 Change history
 ==============
 
+1.3.0a4 (2018-11-15)
+
+* Add ErrHandler.handler_assertion_error.
+
 1.3.0a3 (2018-11-11)
 
 * Hobbit startproject cmd support celery option.
diff --git a/hobbit_core/__init__.py b/hobbit_core/__init__.py
index 6234ae9..1d4711a 100644
--- a/hobbit_core/__init__.py
+++ b/hobbit_core/__init__.py
@@ -1 +1 @@
-VERSION = [1, 3, 0, 'a3']
+VERSION = [1, 3, 0, 'a4']
diff --git a/hobbit_core/flask_hobbit/err_handler.py b/hobbit_core/flask_hobbit/err_handler.py
index 83dd212..6513fc9 100644
--- a/hobbit_core/flask_hobbit/err_handler.py
+++ b/hobbit_core/flask_hobbit/err_handler.py
@@ -33,17 +33,25 @@ def handler_sqlalchemy_orm_exc(cls, e):
         code, message, detail = 500, RESP_MSGS[500], repr(e)
 
         if isinstance(e, orm_exc.NoResultFound):
-            code, message, detail = 404, '源数据未找到', repr(e)
+            code, message, detail = 404, u'源数据未找到', repr(e)
 
         return Result(gen_response(code, message, detail), status=code)
 
+    @classmethod
+    def handler_assertion_error(cls, e):
+        code, message, detail = 422, str(e), repr(e)
+        return Result(gen_response(code, message, detail), status=code)
+
     @classmethod
     def handler_others(cls, e):
         traceback.print_exc()
-        return ServerErrorResult(500, detail=repr(e))
+        return ServerErrorResult(code=500, detail=repr(e))
 
     @classmethod
     def handler(cls, e):
-        exc = 'others' if not hasattr(e, '__module__') else \
-            e.__module__.replace('.', '_')
+        exc = 'others'
+        if hasattr(e, '__module__'):
+            exc = e.__module__.replace('.', '_')
+        elif isinstance(e, AssertionError):
+            exc = 'assertion_error'
         return getattr(cls, 'handler_{}'.format(exc), cls.handler_others)(e)
diff --git a/tests/test_err_handler.py b/tests/test_err_handler.py
new file mode 100644
index 0000000..3e764bd
--- /dev/null
+++ b/tests/test_err_handler.py
@@ -0,0 +1,44 @@
+# -*- encoding: utf-8 -*-
+import json
+
+from sqlalchemy.orm import exc as orm_exc
+from werkzeug import exceptions as wkz_exc
+
+from hobbit_core.flask_hobbit.err_handler import ErrHandler
+
+from . import BaseTest
+
+
+class TestErrHandler(BaseTest):
+
+    def test_assertion_error(self):
+        resp = ErrHandler.handler(AssertionError('message'))
+        assert resp.status_code == 422
+        data = json.loads(resp.get_data())
+        assert data['message'] == 'message'
+
+    def test_sqlalchemy_orm_exc(self):
+        resp = ErrHandler.handler(orm_exc.NoResultFound())
+        assert resp.status_code == 404
+        data = json.loads(resp.get_data())
+        assert data['message'] == u'源数据未找到'
+
+        resp = ErrHandler.handler(orm_exc.UnmappedError())
+        assert resp.status_code == 500
+        data = json.loads(resp.get_data())
+        assert data['message'] == u'服务器内部错误'
+
+    def test_werkzeug_exceptions(self):
+        resp = ErrHandler.handler(wkz_exc.Unauthorized())
+        assert resp.status_code == 401
+        data = json.loads(resp.get_data())
+        assert data['message'] == u'未登录'
+
+    def test_others(self):
+        resp = ErrHandler.handler(Exception('msg'))
+        assert resp.status_code == 500
+        data = json.loads(resp.get_data())
+        assert data['message'] == u'服务器内部错误'
+        # py27,py36 == "Exception('msg',)"
+        # py37 == "Exception('msg')"
+        assert data['detail'].startswith("Exception('msg'")