织梦DedeCMS允许不同会员发布相同文章，不允许同一会员发布重复文章的方法：
打开 /member/inc/archives_check.php 文件
找到
//检测文档是否重复
if($cfg_mb_cktitle=='Y')
{
    $row = $dsql->GetOne("Select * From `dede_archives` where title like '$title' ");
    if(is_array($row))
    {
        ShowMsg("对不起，请不要发布重复文档！","-1","0",5000);
        exit();
    }
}
将
$row = $dsql->GetOne("Select * From `dede_archives` where title like '$title' ");
修改为
$row = $dsql->GetOne("Select * From `dede_archives` where title like '$title' and mid = '".$cfg_ml->M_ID."'");