1. If the contract is signed by the entrusted agent of the unit within the scope of its authorization or the legal representative of the unit, the contract is valid;
2. If the signed entrusted agent signs the contract without the power of attorney, beyond the power of attorney or after the power of attorney is terminated, the signed contract is valid after ratification by the principal;
3. Without ratification, the contract is invalid and the actor shall bear civil liability. Knowing that someone else has committed a civil act in my name without denying it is regarded as consent.
Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.