The single certificate is also called "unmarried certificate", and the legal full name is "certificate of no marriage registration record", which is a written certificate to prove whether the party concerned has registered marriage in the civil affairs department at a certain time, and is generally issued by the civil affairs department where the household registration is located. General agent's single certificate needs: power of attorney from the Public Security Bureau, the original ID card of the client, two photos, the account book of the party, the original ID card, etc.