diff --git a/app.py b/app.py
index e94d3c7..81b17bf 100644
--- a/app.py
+++ b/app.py
@@ -930,7 +930,7 @@ def export_certificate_view(cert_id):
                     # 添加证书文件
                     with open(cert['cert_path'], 'r') as f:
                         cert_content = f.read()
-                    zf.writestr(f"{cert['common_name']}.crt", cert_content)
+                    zf.writestr(f"{cert['common_name']}.pem", cert_content)
 
                     # 添加私钥文件
                     with open(cert['key_path'], 'r') as f: