To sign a contract on behalf of others, there should be a power of attorney. Article 65 General Principles of the Civil Law A civil juristic act may be entrusted in writing or orally. If the law requires it to be in writing, it shall be in writing. The written power of attorney for entrusted agency shall specify the name, agency matters, authority and time limit of the agent, and shall be signed or sealed by the principal. If the power of attorney is unclear, the client shall bear civil liability to the third party, and the agent shall bear joint liability.

A contract is an agreement between civil subjects to establish, change and terminate a civil legal relationship. Article 464 of the Civil Code of People's Republic of China (PRC): The legal provisions on identity relations apply to marriage, adoption and guardianship agreements; If there are no provisions, the provisions of Part III can be applied by reference according to its nature. Contracts established according to law are protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law.