legal ground
Article 10 of the Regulations of People's Republic of China (PRC) Municipality on Household Registration
If a citizen moves out of the place under the jurisdiction of the household registration, he or the head of the household shall apply to the household registration authority for emigration registration, obtain a migration certificate and cancel the household registration.
Citizens who move from rural areas to cities must apply to the permanent residence registration authority for moving out with the employment certificate of the urban labor department, the school admission certificate, or the approval certificate of the urban household registration authority.
Citizens moving to border areas must be approved by the public security organs of the counties, cities and municipal districts where they live.
Article 19
When a citizen's household registration changes due to marriage, divorce, adoption, claim, separation, merger, disappearance, recovery or other reasons, the head of the household or himself shall declare the change registration to the household registration authority.