how wpa_suppliant processes the chinese characters---and the ssid can't connect

[root]

i forget asking that when i set the ssid in chinese characters, the ap
can't connected, my ap is use wep,and the ssid is TP-LINK_GZB____dddd, 
the ____is the chinese characters, the i used the command is:
 wpa_suppliant -Dwext -iwlan2 -c/etc/wpa_supplicant.conf -dd

and from the log,it seems that the wpa_suppliant to Try to find non-WPA
AP, but when it turns to TP-LINK_GZB____dddd: the log is:
   7: 00:25:86:fc:3b:3c ssid='TP-LINK_GZB____dddd' wpa_ie_len=0
rsn_ie_len=0 caps=0x11
   skip - no WPA/RSN IE

does the wpa_suppliant not support the chinese ssid? very need your
help, thanks for advance!!