who obtain china visa still they need to obtain Hong kong visa for touism ?

Dear Sir,
Please advise those who obtain china tourist visa can they enter hong kong or need to also apply for hong kong visa ? (Passport they are holding is Palestinian)
If not and they need to have hong kong visa what are the requirements for Palestinian passport holders? Complete Form A&B, passport, residence visa, NOC sponsor letter, bank statement for 3 month, return ticket, hotel booking.