1. Generally, a contract that is not signed by me is invalid. If both parties want to engage in civil activities, they must sign a civil contract, in which the rights and obligations of both parties are clearly defined, and the contract needs to be signed by both parties to have legal effect.

2. Legal basis: Article 165th of the Civil Code of People's Republic of China (PRC).

If the power of attorney is in written form, the power of attorney shall specify the agent's name, agency matters, authority and time limit, and shall be signed or sealed by the principal.

Article 169

If an agent needs to entrust a third party to act as an agent, it shall obtain the consent or ratification of the principal.

If the entrusted agent is approved or ratified by the principal, the principal may directly instruct the entrusted third party on the agency affairs, and the agent is only responsible for the choice and instruction of the third party.

If the entrusted agent is not approved or ratified by the principal, the agent shall be responsible for the behavior of the entrusted third party; However, in an emergency, in order to safeguard the interests of the principal, the agent needs to entrust a third party.

Second, what are the conditions for the contract to take effect?

1, the parties to the contract have corresponding capacity for civil rights and capacity for civil conduct;

2. The intention of the parties to the contract is true;

3. The contract does not violate the law or public interest.