Dear Kenichi,

This problem have been resoved by you, in my mind, but now, it appear again.

Attached are two tex files encoded with GB18030, the Emacs will display
GB18030-nomal.tex correctly, but the chinese characters in GB18030-chaos.tex
will be chaos, all the chaos codes use the *ISO8859-1*  encoding scheme.

Why?

Best,
Hongsheng.

P.S.  Both of the two files can be correctly displayed by gedit on my computer.