✔ 最佳答案
Actually, you can find enough information on the website of the French Consulate of Hong Kong.
http://www.consulfrance-hongkong.org/spip.php?article354
Here is the document you need to hand in
Old French passport
1 passport photo (limitation refered to website)
Evidence of address (e.g. electric bill, phone bill, etc)
Passport renewal charge (60 euro for adults, paid in HKD)
I am not sure if he needs to fill in a form because it's not mentioned on the website. All application should be done in the Consulate General of France in Hong Kong located in Admiralty.
For further information, you can contact M. David Vivier by phone 3752 9954. He prefers to be contacted in the afternoon, or by enquiry form on the website.