diff --git a/applications/common/utils/gen_captcha.py b/applications/common/utils/gen_captcha.py
index 12c490e..068aa58 100644
--- a/applications/common/utils/gen_captcha.py
+++ b/applications/common/utils/gen_captcha.py
@@ -8,7 +8,7 @@ def gen_captcha(content='2345689abcdefghijklmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWX
     """ 生成验证码 """
     image = ImageCaptcha()
     # 获取字符串
-    captcha_text = "".join(choices(content, k=4))
+    captcha_text = "".join(choices(content, k=4)).lower()
     # 生成图像
     captcha_image = Image.open(image.generate(captcha_text))
     return captcha_text, captcha_image
diff --git a/applications/view/passport/__init__.py b/applications/view/passport/__init__.py
index 51552a7..16a971d 100644
--- a/applications/view/passport/__init__.py
+++ b/applications/view/passport/__init__.py
@@ -35,7 +35,7 @@ def login_post():
     req = request.form
     username = req.get('username')
     password = req.get('password')
-    code = req.get('captcha')
+    code = req.get('captcha').__str__().lower()
 
     if not username or not password or not code:
         return fail_api(msg="用户名或密码没有输入")