You need apply for L tourist visa, and the requirements include;
1. One completed and signed Visa Application Form with a passport photograph attached;

2. Your passport with at least 6-month validity and at least 2 blank visa pages.
3. round-trip air tickets and confirmed hotel booking form.

we dont need to book for hotels coz after we arrive in hongkong we are going to stay 1 night on our family friend then after a day we plan to visit our uncle in xiamen and stay there in their house for 2nights then back again to hongkong after 3days then oct.1 is our flight going to philippines...so what are the requirements?should we include the hotel booking requirements even we are not going to stay in the hotels?

You don't need to provide the hotel booking since your trip is for visiting relatives. Your uncle should send you an invitation letter with his address clearly written on it.