Chinese parents expect a son-in law to love their daughter and take care of her emotionally and financially. Be respectful to the parents and elderly relatives. Bring gifts to the first meeting. If the father like smoking or drinking, bring wine and cigarettes. If he doesn't, then bring something else like snacks or fruits wrapped in very nice packaging. Take the family to a good restaurant for dinner, talk about your wedding plan and future during the dinner. Afterwards ask your girlfriend how her parents feel about you and what are their expectations about wedding gift money etc. First meeting should be formal but warm and friendly. Everything else can be discussed later. Good luck!
MANU:The main (key) thing is to make the family feel that you are a motivated and reliable person who loves their daughter and can guarantee a certain standard of living in the future before they entrust you with their daughter.