Legal basis
Article 469 of the Civil Code of the People's Republic of China
The parties may conclude a contract in written form, orally or in other forms.
the written form is a form that can tangibly express the contents, such as contract, letter, telegram, telex and fax.
The contents can be tangibly expressed by electronic data interchange, e-mail, etc., and the data message that can be accessed at any time is regarded as a written form.
Article 49
Where a contract is concluded by the parties in the form of a contract, the contract is formed when all the parties have signed, sealed or fingerprinted it. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.
Article 52
A contract formed according to law shall become effective upon its formation, unless otherwise provided by law or agreed by the parties.