diff --git a/admin/custom-fields-js.php b/admin/custom-fields-js.php
index 3b7205f8..4f27fddc 100644
--- a/admin/custom-fields-js.php
+++ b/admin/custom-fields-js.php
@@ -30,7 +30,7 @@ $(document).ready(function () {
     });
 
     $('#custom-field button.operate-add').click(function () {
-        var html = '<tr><td><input type="text" name="fieldNames[]" placeholder="<?php _e('字段名称'); ?>" class="text-s w-100"></td>'
+        var html = '<tr><td><input type="text" name="fieldNames[]" placeholder="<?php _e('字段名称'); ?>" pattern="^[_a-zA-Z][_a-zA-Z0-9]*$" oninput="this.reportValidity()" class="text-s w-100"></td>'
                 + '<td><select name="fieldTypes[]" id="">'
                 + '<option value="str"><?php _e('字符'); ?></option>'
                 + '<option value="int"><?php _e('整数'); ?></option>'
diff --git a/admin/custom-fields.php b/admin/custom-fields.php
index 8e94b0bd..fbedd7b9 100644
--- a/admin/custom-fields.php
+++ b/admin/custom-fields.php
@@ -26,7 +26,7 @@ $defaultFields = isset($post) ? $post->getDefaultFieldItems() : $page->getDefaul
                 <td>
                     <label for="fieldname" class="sr-only"><?php _e('字段名称'); ?></label>
                     <input type="text" name="fieldNames[]" value="<?php echo htmlspecialchars($field['name']); ?>"
-                           id="fieldname" class="text-s w-100">
+                           id="fieldname" pattern="^[_a-zA-Z][_a-zA-Z0-9]*$" oninput="this.reportValidity()" class="text-s w-100">
                 </td>
                 <td>
                     <label for="fieldtype" class="sr-only"><?php _e('字段类型'); ?></label>
@@ -56,7 +56,7 @@ $defaultFields = isset($post) ? $post->getDefaultFieldItems() : $page->getDefaul
                 <td>
                     <label for="fieldname" class="sr-only"><?php _e('字段名称'); ?></label>
                     <input type="text" name="fieldNames[]" placeholder="<?php _e('字段名称'); ?>" id="fieldname"
-                           class="text-s w-100">
+                           class="text-s w-100" pattern="^[_a-zA-Z][_a-zA-Z0-9]*$" oninput="this.reportValidity()">
                 </td>
                 <td>
                     <label for="fieldtype" class="sr-only"><?php _e('字段类型'); ?></label>