Don't China people immigrate when they marry Portuguese?

This kind of immigration belongs to marriage. In principle, if you marry a Portuguese citizen, you can get a residence card similar to your relatives.

Migration is the general name of population migration activities between different regions. As a noun, it refers to a person or a collection of people (crowd), that is, a collection of floating population. As a gerund, it refers to population migration activities. Immigration is not necessarily accompanied by nationality change, including migration and nationality change.