diff --git a/modules/member/skins/default/filter/signup.xml b/modules/member/skins/default/filter/signup.xml
index b7d519c74..402959783 100644
--- a/modules/member/skins/default/filter/signup.xml
+++ b/modules/member/skins/default/filter/signup.xml
@@ -1,6 +1,6 @@
 <filter name="signup" module="member" act="procMemberInsert" extend_filter="member.getJoinFormList" confirm_msg_code="confirm_submit">
     <form>
-        <node target="user_id" required="true" minlength="2" maxlength="80" filter="userid" />
+        <node target="user_id" required="true" minlength="3" maxlength="20" filter="userid" />
         <node target="password1" required="true" minlength="6" maxlength="20" />
         <node target="password2" required="true" minlength="6" maxlength="20" equalto="password1" />
         <node target="user_name" required="true" minlength="2" maxlength="40" />
diff --git a/modules/member/tpl/filter/insert.xml b/modules/member/tpl/filter/insert.xml
index e7fcf4d3c..caab35f32 100644
--- a/modules/member/tpl/filter/insert.xml
+++ b/modules/member/tpl/filter/insert.xml
@@ -1,6 +1,6 @@
 <filter name="insert" module="member" act="procMemberAdminInsert" extend_filter="member.getJoinFormList" confirm_msg_code="confirm_submit" >
     <form>
-        <node target="user_id" required="true" minlength="2" maxlength="80" />
+        <node target="user_id" required="true" minlength="3" maxlength="20" />
         <node target="user_name" required="true" minlength="2" maxlength="40" />
         <node target="nick_name" required="true" minlength="2" maxlength="40" />
         <node target="email_address" required="true" minlength="1" maxlength="200" filter="email"/>