Household registration is a legal document that the state administrative organ is responsible for household registration management and used to record and preserve the basic information of residents. It is the identification of every citizen. Household registration is a public record book registered by households and issued with certificates, including natural person's name, date of birth, kinship, marital status, divorce, adoption, death and other information. The purpose of household registration is to manage and count population information, provide citizens with social security, education, employment and other services, and play an important role in law, policy and social management.