According to the laws of our country, one party can sign a contract with multiple parties, and all parties will enjoy the rights and perform the obligations together. If the parties are similar, it may be easier to enter into one contract. As for whether the contract is valid, it depends on the specific content of the contract. It cannot be determined simply by multiple signatures. A contract is invalid if any of the following circumstances occurs: (1) One party concludes the contract by means of fraud or coercion, harming national interests; (2) Malicious collusion, harming the interests of the country, the collective or a third party; (3) Covering up in legal forms Illegal purposes; (4) Harmful public interests; (5) Violation of mandatory provisions of laws and administrative regulations.

Legal basis:

Article 490 of the Civil Code: Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it.

Laws and administrative regulations or the parties agree that a contract should be concluded in writing. If the parties do not use writing but one party has performed its main obligations and the other party accepts it, the contract is established.