To make chinese songs shows correctly in mpd, add these two lines in your mpd.conf

filesystem_charset              "UTF8"
id3v1_encoding                  "UTF8"

Now you should be able to see familiar characters in Sonata. Further, if you want chinese work in ncmpc, try this:

sudo cp /usr/lib/libncursesw.so.5.6 /usr/lib/libncurses.so.5.6

* Your terminal should be configured correctly to display chinese characters