[Ned Scott]

I also tried some blu-ray movie on the official XBMC (for Windows), I disabled subtitle when playing the movie and pressed the stop to go back to the file list, and chose the same movie to play agian, the status of subtitle was enabled.

So it seems that's the design of XBMC.

Correct me if I was wrong.

That sounds like a bug. XBMC/Kodi should remember if you've disabled subtitles for a specific video.