thanks for your reply.
The screenhot and log were not collected in the same time.
But I'm sure the address marked in screnshot is equal to “from” attribute （like ’aaaaa_og6@conference.bzwang‘） in
“<presence id="yBjsG-11" to="bbbbb@bzwang/Smack" from="aaaaa_og6@conference.bzwang/bbbbb"><x xmlns="http://jabber.org/protocol/muc#user"><item jid="bbbbb@bzwang/Smack" affiliation="none" role="participant"/></x></presence>”