1. You need to go to www.gov.hk/marriagebooking and download a profile from there.
2. Required are foreign passports and a completed application form (plus photocopies of passports are required). If before they were married, then it is necessary to provide divorce documents in English certified by a notary.
3. One pair needs personally submit documents to any registry office in Hong Kong.
4. When submitting documents, it is necessary to pay a state fee.
5. After submitting documents, you will be given a date of marriage, in about 2-3 weeks.
6. At the end of the procedure you will be given a certificate in English and Chinese.

You can try to apply only at www.gov.hk/marriagebooking, but as a rule, all the above points you have to do.

Required documents:

1. Identity card (passport), which indicates the owner's data.
2. A widow or widower who remarries must provide a previous marriage certificate and a death certificate of the spouse.
3. Evidence of the consent of the person concerned if one of the parties is less than 21 years old.
4. Information about the current occupation.
5. Proof of Age (birth certificate).
6. Full name of both parents for both parties.
7. A document indicating the actual place and address of residence.
8. A divorcee must submit a copy of the divorce certificate certified by the seal and a notarized copy certified by the notary.