hello! me i know what is the requirements for me to get a tourist visa in hongkong?

How long will you stay in HK?
If you just stay for less than 14 days, you do not need to apply it, but just use your valid passport to travel. Meanwhile, you still need to prepare your round trip tickets as well as an invitation letter from your fiancee.

If you want to stay longer, you can enter HK first and then make extension there.