The law does not clearly stipulate the number of copies to be signed, and only one contract does not violate the law and does not affect the effectiveness of the contract. However, from the perspective of risk prevention and control, the signatories should each hold one copy. Only one contract is more risky for the non-controlling party. Once the other party fails to perform the contract, it is relatively difficult to prove the contractual relationship between the two parties and the other party's liability for breach of contract. If a lawsuit is filed, it is easy to lose because of insufficient evidence.
legal ground
Article 490 of the Civil Code stipulates that if the parties conclude a contract in the form of a contract, the contract is 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.