Generally, an agreement is invalid only if it is signed unilaterally. According to the relevant laws and regulations, a contract concluded in written form is established after the parties sign, seal or press their fingerprints. The contract is established according to law, and it has corresponding legal effect when it is established.

legal ground

Article 143 of the Civil Code of People's Republic of China (PRC)

A civil juristic act that meets the following conditions is valid:

(1) The actor has corresponding capacity for civil conduct;

(2) the meaning is true;

(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.

Article 490

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.