my $ping = MT::TBPing->new;
$ping->blog_id($tb->blog_id);
$ping->tb_id($tb_id);
$ping->source_url($url);
$ping->ip($app->remote_ip || ''); 

在其前面加上：

#################convert gb2312 into utf-8 if necessary#######
require LWP::UserAgent;
my $ua = LWP::UserAgent->new;
my $req = HTTP::Request->new(GET => $url);
my $res = $ua->request($req);
if ($res->is_success) {
     my $content=$res->content;
     if ($content =~ /text\/html.*charset=.*gb.*>/gi ){
        $excerpt = `echo $excerpt | iconv -f GB2312 -t UTF-8`;
        $title = `echo $title | iconv -f GB2312 -t UTF-8`;
        $blog_name = `echo $blog_name | iconv -f GB2312 -t UTF-8`;
    }
}

##############end convert gb2312 to utf8##################

完毕！

上述修改在MT 3.x版本上适用，依照Hedong所说，如果系统安装了mt-blacklist，则需要修改$MTHOME/extlib/jayallen/MTBlPing.pm，位置相同。