diff --git a/fir_ser/api/tasks.py b/fir_ser/api/tasks.py
index 419b215..879c39a 100644
--- a/fir_ser/api/tasks.py
+++ b/fir_ser/api/tasks.py
@@ -6,6 +6,8 @@
 
 import logging
 
+from captcha.models import CaptchaStore
+
 from api.utils.ctasks import sync_download_times, auto_clean_upload_tmp_file
 from api.views.login import get_login_type
 from common.core.sysconfig import Config, invalid_config_cache
@@ -48,6 +50,11 @@ def auto_clean_upload_tmp_file_job():
     auto_clean_upload_tmp_file()
 
 
+@app.task
+def auto_clean_captcha_store_job():
+    CaptchaStore.remove_expired()
+
+
 @app.task
 def auto_delete_tmp_file_job():
     auto_delete_ios_mobile_tmp_file()
diff --git a/fir_ser/api/utils/utils.py b/fir_ser/api/utils/utils.py
index f5fb85f..3b8fd3f 100644
--- a/fir_ser/api/utils/utils.py
+++ b/fir_ser/api/utils/utils.py
@@ -23,27 +23,32 @@ from common.utils.sendmsg import SendMessage
 from common.utils.storage import Storage
 from common.utils.token import generate_numeric_token_of_length, generate_alphanumeric_token_of_length, make_token, \
     verify_token
-from fir_ser.settings import CAPTCHA_LENGTH, MEDIA_ROOT
+from fir_ser.settings import MEDIA_ROOT
 
 logger = logging.getLogger(__name__)
 
 
 def get_captcha():
-    captcha_key = CaptchaStore.generate_key()
+    # 随机字符串
+    random_char_fun = 'captcha.helpers.random_char_challenge'
+
+    # 数学运算
+    math_fun = 'captcha.helpers.math_challenge'
+
+    captcha_key = CaptchaStore.generate_key(random_char_fun)
     captcha_image = captcha_image_url(captcha_key)
-    CaptchaStore.remove_expired()
     local_storage = LocalStorage(**Config.IOS_PMFILE_DOWNLOAD_DOMAIN)
     return {"captcha_image": "/".join([local_storage.get_base_url(), captcha_image.strip("/"), '']),
             "captcha_key": captcha_key,
-            "length": CAPTCHA_LENGTH}
+            "length": len(CaptchaStore.objects.filter(hashkey=captcha_key).first().response)}
 
 
 def valid_captcha(captcha_key, code, username):
     if username:
-        challenge = CaptchaStore.objects.filter(hashkey=captcha_key).values("challenge").first()
-        logger.info(f"captcha_key:{captcha_key} code:{code}  challenge:{challenge}")
-        if challenge:
-            if captcha_key and code and code.strip(" ").lower() == challenge.get("challenge").lower():
+        captcha_obj = CaptchaStore.objects.filter(hashkey=captcha_key).values("response").first()
+        logger.info(f"captcha_key:{captcha_key} code:{code}  challenge:{captcha_obj}")
+        if captcha_obj:
+            if captcha_key and code and code.strip(" ").lower() == captcha_obj.get("response").lower():
                 return True
     return False
 
diff --git a/fir_ser/fir_ser/settings.py b/fir_ser/fir_ser/settings.py
index a68cb8b..2563cda 100644
--- a/fir_ser/fir_ser/settings.py
+++ b/fir_ser/fir_ser/settings.py
@@ -292,6 +292,7 @@ SYNC_CACHE_TO_DATABASE = {
     'wx_get_access_token_times': 60 * 10,  # 微信access_token 自动获取时间
     'try_login_times': (10, 12 * 60 * 60),  # 当天登录失败次数，超过该失败次数，锁定24小时
     'auto_clean_tmp_file_times': 60 * 30,  # 定时清理上传失误生成的临时文件
+    'auto_clean_captcha_store_times': 60 * 60,  # 定时清理临时验证码数据
     'auto_clean_local_tmp_file_times': 60 * 30,  # 定时清理临时文件,现在包含超级签名描述临时文件
     'try_send_msg_over_limit_times': (3, 60 * 60),  # 每小时用户发送信息次数
     'clean_local_tmp_file_from_mtime': 60 * 60,  # 清理最后一次修改时间超过限制时间的临时文件,单位秒
@@ -452,6 +453,11 @@ CELERY_BEAT_SCHEDULE = {
         'schedule': SYNC_CACHE_TO_DATABASE.get("auto_clean_local_tmp_file_times"),
         'args': ()
     },
+    'auto_clean_captcha_store_job': {
+        'task': 'api.tasks.auto_clean_captcha_store_job',
+        'schedule': SYNC_CACHE_TO_DATABASE.get("auto_clean_captcha_store_times"),
+        'args': ()
+    },
     'auto_check_ios_developer_active_job': {
         'task': 'xsign.tasks.auto_check_ios_developer_active_job',
         # 'schedule': SYNC_CACHE_TO_DATABASE.get("auto_check_ios_developer_active_times"),