Hi! As I can't write Chinese, you'll have to translate this comment. I'm assuming you mean "memorise" as in being able to play a piece without the music sheet. I would suggest, 1. Try to "understand" the music as much as possible. Specifically, analyse the musical structure, even if it's just in basic terms (e.g. "what ideas come back?"). 2. Maintain a consistent practice. This doesn't mean long hours, but rather spread your time across days. Hope this helps!
