diff --git a/backend/application/settings.py b/backend/application/settings.py
index 35a6a21..5d0fbc9 100644
--- a/backend/application/settings.py
+++ b/backend/application/settings.py
@@ -287,9 +287,12 @@ CAPTCHA_LENGTH = 4   # 字符个数
 CAPTCHA_TIMEOUT = 1   # 超时(minutes)
 #加减乘除验证码
 CAPTCHA_OUTPUT_FORMAT = '%(image)s %(text_field)s %(hidden_field)s '
-CAPTCHA_NOISE_FUNCTIONS = ('captcha.helpers.noise_null',
-                           'captcha.helpers.noise_arcs', # 线
-                           'captcha.helpers.noise_dots', # 点
+CAPTCHA_FONT_SIZE = 40 # 字体大小
+CAPTCHA_FOREGROUND_COLOR = '#0033FF'  # 前景色
+CAPTCHA_BACKGROUND_COLOR = '#F5F7F4'  # 背景色
+CAPTCHA_NOISE_FUNCTIONS = (
+                           # 'captcha.helpers.noise_arcs', # 线
+                           # 'captcha.helpers.noise_dots', # 点
                            )
 # CAPTCHA_CHALLENGE_FUNCT = 'captcha.helpers.random_char_challenge'
 CAPTCHA_CHALLENGE_FUNCT = 'captcha.helpers.math_challenge'