diff --git a/cert/__init__.py b/cert/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/cert/macos.py b/cert/macos.py
new file mode 100644
index 0000000..46a3abb
--- /dev/null
+++ b/cert/macos.py
@@ -0,0 +1,9 @@
+import subprocess
+
+
+def is_certificate_installed(cert_name = 'mitmproxy'):
+    try:
+        result = subprocess.run(['security', 'find-certificate', '-c', cert_name], capture_output=True, text=True)
+        return result.returncode == 0
+    except FileNotFoundError:
+        raise NotImplementedError("此系统中未找到 security 命令")
diff --git a/cert/win.py b/cert/win.py
new file mode 100644
index 0000000..18261c7
--- /dev/null
+++ b/cert/win.py
@@ -0,0 +1,13 @@
+import wincertstore
+import os
+
+
+def is_certificate_installed(cert_name = "mitmproxy"):
+    stores = ["MY", "ROOT", "CA"]
+    for storename in stores:
+        with wincertstore.CertSystemStore(storename) as store:
+            for cert in store.itercerts():
+                name = cert.get_name()
+                if name == cert_name:
+                    return True
+    return False
diff --git a/utils.py b/utils.py
index c3781ee..5741895 100644
--- a/utils.py
+++ b/utils.py
@@ -1,13 +1,18 @@
 import re
-import subprocess
 import urllib.request
+
 import requests
 
+from cert import macos
+
+
+# 检查代理是否正确
 def is_proxy_correct(target_proxy_address):
     proxy = urllib.request.getproxies()
     response = requests.get('http://mitm.it', proxies=proxy).text
 
-    if re.search(r'If you can see this, traffic is not passing through mitmproxy', response) or proxy != target_proxy_address:
+    if re.search(r'If you can see this, traffic is not passing through mitmproxy',
+                 response) or proxy != target_proxy_address:
         print("\n检测到系统的网络代理设置不正确")
         print(f"当前网络代理: {proxy}")
         print(f"目标网络代理: {target_proxy_address}")
@@ -16,50 +21,15 @@ def is_proxy_correct(target_proxy_address):
         return True
 
 
-cert_name = 'mitmproxy'
-
-def is_certificate_installed_macos():
-    try:
-        result = subprocess.run(['security', 'find-certificate', '-c', cert_name], capture_output=True, text=True)
-        return result.returncode == 0
-    except FileNotFoundError:
-        raise NotImplementedError("此系统中未找到 security 命令")
-
-def is_certificate_installed_windows():
-    import wincertstore
-    import os
-    from cryptography import x509
-    from cryptography.hazmat.backends import default_backend
-    import hashlib
-
-    def is_certificate_installed(cert_name, thumbprint=None):
-        if os.name != 'nt':
-            raise NotImplementedError("此函数仅适用于 Windows")
-
-        stores = ["MY", "ROOT", "CA"]
-        for storename in stores:
-            with wincertstore.CertSystemStore(storename) as store:
-                for cert in store.itercerts():
-                    name = cert.get_name()
-                    pem = cert.get_pem().decode("ascii")
-                    if name == cert_name:
-                        if thumbprint is None:
-                            return True
-                        else:
-                            cert_obj = x509.load_pem_x509_certificate(pem.encode('utf-8'), default_backend())
-                            der = cert_obj.public_bytes(x509.Encoding.DER)
-                            computed_thumbprint = hashlib.sha1(der).hexdigest().upper()
-                            if computed_thumbprint == thumbprint:
-                                return True
-        return False
-
-# 检测证书是否安装
+# 检查证书是否安装
 def wait_until_certificate_installed():
     while True:
-        if is_certificate_installed_macos():
+        if macos.is_certificate_installed('mitmproxy'):
             break
         else:
-            input("系统中未检测到 mitmproxy 的证书，请进行手动安装。\n证书安装教程请参考: https://docs.mitmproxy.org/stable/concepts/certificates/#installing-the-mitmproxy-ca-certificate-manually\n\n证书安装后请按任意键继续")
+            input(
+                "系统中未检测到 mitmproxy 的证书，请进行手动安装。\n证书安装教程请参考: https://docs.mitmproxy.org/stable/concepts/certificates/#installing-the-mitmproxy-ca-certificate-manually\n\n证书安装后请按任意键继续")
+
 
 # 检查系统代理是否设置正确
 def wait_until_proxy_setting(proxy_address):
@@ -69,7 +39,8 @@ def wait_until_proxy_setting(proxy_address):
         else:
             input("\n按任意键继续")
 
-def wait_until_env_configured(proxy_address = None):
+
+def wait_until_env_configured(proxy_address=None):
     # 检查证书是否安装
     wait_until_certificate_installed()