How to make our fulltext indexing?

how can i make our fulltext indexing?
our encoding is GB2312 or GBK,
but after I changed
"default encoding"
“word fragment index” option,and I set the field index to “text”,I can not see any speed improvement.


the admin xql is:
<A HREF=“http://192.168.0.22/tamino/SHJYK?_admin=ino:DisplayIndex[“Document”,“Document/ZhengWen”,“A”,“10”,“standard”” TARGET=_blank>http://192.168.0.22/tamino/SHJYK?_admin=ino:DisplayIndex(“Document”,“Document/ZhengWen”,“A”,“10”,“standard”)

the result is:
<?xml version="1.0" ?>
- <ino:response xmlns:ino=“http://namespaces.softwareag.com/tamino/response2” xmlns:xql=“http://metalab.unc.edu/xql/”>
- <ino:message ino:returnvalue=“8257”>
<ino:messagetext ino:code=“INOXHE8257”>Conversion failed, output encoding -1, error code 304.</ino:messagetext>
</ino:message>
</ino:response>