What is Hong Kong DI?

Hong Kong DI is the English abbreviation of "Hong Kong Visa Identity Certificate". The whole process is "DOCUMENT OF IDENTITY"

Because non-permanent Hong Kong residents cannot apply for a SAR passport, a travel document is required if you go abroad. The "Hong Kong Visa Identity Certificate" is mainly for new immigrants from the mainland who have been in Hong Kong for less than 7 years, or other Hong Kong residents who cannot apply for a passport from any country. It functions like a passport, but you need to obtain a visa for that country before going to any country.

Hong Kong passport is visa-free for more than 140 countries