When I put english instead of 2byte charactor, xmlnode_str() works well. But
if I use 2byte charactor, It works terrable, always return NULL.
You probably need to convert the non-ascii characters into whatever encoding libxode is expecting (most likely UTF-8). I would guess that you are using your system's native character set, which is probably not Unicode or UTF-8.
So check the libxode docs (if any) or source code to see what kind of encoding it expects. Then if there is a mismatch, you'll need to convert your text into the right encoding; your OS may have utilities for doing this.
--Jens
