If you want to know whether a person is married, you must be authorized by the parties and carry the power of attorney notarized by the notary office to the marriage registration office.
How to find out if a person is married
Provisions on the use of marriage registration archives
China's "Measures for the Administration of Marriage Registration Archives" makes the following provisions on the use of marriage registration archives:
3, the parties to the marriage hold legal identity documents, can consult their marriage registration files. If the parties to the marriage are unable to consult the matter in person for some reason, they may apply for a power of attorney and entrust another person to do it on their behalf, and the power of attorney shall be notarized by a notary office.
4, the people's court, the people's procuratorate, the public security and security departments to confirm the marriage relationship of the parties, with the unit's letter of introduction can consult the marriage registration files.
7. Units, organizations and individuals using marriage registration files shall not disclose the contents of marriage registration files and shall not damage the legitimate rights and interests of the parties to marriage registration.
8, marriage registration files shall not be lent, only on the spot inspection. The photocopied marriage registration files shall be valid only if they are stamped with the seal of the marriage registration archives custodian department.