Can be immigrants.

Immigrants only enjoy the right of permanent residence in the country where they live, not citizens of that country, and their nationality remains unchanged, so their household registration and other identity documents still exist and are valid after immigration. They will become foreign citizens after joining the nationality of another country. China does not allow citizens to have dual citizenship. After joining a foreign nationality, you must give up your China nationality. At this time, their household registration will be cancelled and other identity documents will be invalid. Immigration is not equal to naturalization, which are two different concepts.