Legal basis:
People's Republic of China (PRC) Civil Code
Article 469 The parties may conclude a contract in writing, orally or in other forms.
Written form refers to contracts, letters, telegrams, telexes, faxes and other forms that can tangibly express the contents contained.
A data message that can tangibly express its content through electronic data interchange, e-mail, etc. , and can be retrieved at any time, are considered in writing.
Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed when 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.