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."'");