If you input any Chinese into a new buffer, Ntemacs will use the same font as ASCII characters (iso8859-1). Of course that font is not suitable for Chinese, so I get only white spaces on the window. describe-char shows that emacs has detected that it's a Chinese character, but chosen a wrong font(wrong charset):
character: สต (23454, #o55636, #x5b9e)
preferred charset: gb18030 (GB18030)
code point: 0xCAB5
syntax: w which means: word
category: C:Chinese (Han) characters of 2-byte character sets c:Chinese
|:While filling, we can break a line at this character.
buffer code: #xE5 #xAE #x9E
file code: #xCA #xB5 (encoded by coding system chinese-gb18030-unix)
display: by this font (glyph code)
-outline-Monaco-normal-normal-normal-mono-13-*-*-*-c-*-iso8859-1 (#x03)
if I open a existed file with Chinese characters, everything goes well.
Best wishes.
Kevin