legal ground
Article 4 of the Regulations on Marriage Registration
When mainland residents get married, both men and women should go to the marriage registration office where one of them has a permanent residence.
Article 5
Mainland residents applying for marriage registration shall produce the following documents and supporting materials:
(1) My household registration book and ID card;
(2) A signed statement that I have no spouse and no direct blood relationship with the other party and collateral blood relationship within three generations.
Article 7
The marriage registration authority shall examine the certificates and certification materials issued by the parties to the marriage registration and ask about the relevant situation. If the parties meet the conditions for marriage, they shall register on the spot and issue a marriage certificate; If the parties do not meet the conditions for marriage and refuse to register, they shall explain the reasons to the parties.