songs with chinese characters in path doesn't show up in playlist?

M3U playlists don’t work with non-ASCII characters. You have to use M3U8 (Unicode UTF-8 encoded) playlists, these support all special characters. On Windows you can use e.g. Winamp for creating M3U8 playlists, other programs which should support M3U8: Foobar, MediaMonkey, iTunes.