Legal analysis: A contract established according to law becomes effective upon its establishment. If the parties conclude a contract in the form of a contract, the contract shall be established when all the parties sign, seal or fingerprint it.

legal basis: article 49 of the civil code of the people's Republic of China

if the parties conclude a contract in the form of a contract, the contract shall be formed when all the parties sign, seal or fingerprint it. 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 writing as stipulated by laws and administrative regulations or agreed by the parties. if the parties fail to do so in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.

article 52 a legally formed contract shall come into effect upon its formation, unless otherwise provided by law or agreed by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should go through the formalities of approval, such provisions shall prevail. If the failure to go through the formalities of approval and so on affects the effectiveness of the contract, it will not affect the performance of the obligation clauses such as approval and the effectiveness of relevant clauses in the contract. If the party who should go through the formalities of applying for approval fails to perform his obligations, the other party may request him to bear the responsibility for violating the obligations. In accordance with the provisions of laws and administrative regulations, the provisions of the preceding paragraph shall apply to the modification, assignment and dissolution of the contract, which should be approved.