Legal analysis: It is not necessary to have a power of attorney to sign a contract. If the other party believes that the actor has agency power, the act of entering into the contract is also valid.

Legal basis: "People's Republic of China and Civil Code"

Article 165 If the authorization for an agent is in written form, the power of attorney shall specify the agent name, agency matters, authority and term, and shall be signed or stamped by the principal.

Article 161 A civil subject may perform civil legal acts through an agent. According to legal provisions, parties' agreement or the nature of the civil legal act, civil legal acts that should be carried out by the person himself shall not be represented by an agent.

Article 162: Civil legal acts performed by an agent in the name of the principal within the scope of agency authority shall be effective against the principal.

Article 172 If the actor has no agency authority, exceeds the agency authority, or continues to perform agency acts after the termination of the agency authority, and the counterparty has reason to believe that the actor has agency authority, the agency act is valid.