diff --git a/templates/create_certificate.html b/templates/create_certificate.html
index 2a2d9d2..47de852 100644
--- a/templates/create_certificate.html
+++ b/templates/create_certificate.html
@@ -61,13 +61,13 @@
                     <input type="text" class="form-control" id="common_name" name="common_name"
                            pattern="[a-zA-Z0-9.-]+"
                            title="只能包含字母、数字、点号和短横线，且不能以点号或短横线开头或结尾">
-                           pattern="[a-zA-Z0-9.-]+"
-                           title="只能包含字母、数字、点号和短横线，且不能以点号或短横线开头或结尾">
                     <div class="form-text">多个DNS用逗号分隔，如: example.com,www.example.com</div>
                 </div>
                 <div class="col-md-6">
                     <label for="san_ip" class="form-label">SAN IP (可选)</label>
-                    <input type="text" class="form-control" id="san_ip" name="san_ip">
+                    <input type="text" class="form-control" id="common_name" name="common_name"
+                           pattern="[a-zA-Z0-9.-]+"
+                           title="只能包含字母、数字、点号和短横线，且不能以点号或短横线开头或结尾">
                     <div class="form-text">多个IP用逗号分隔，如: 192.168.1.1,10.0.0.1</div>
                 </div>
             </div>