Legal analysis: Two or more parties to a contract or agreement can freely agree on the effective conditions of the contract or agreement, including only stamping or signing, stamping and signing, signing and authorization, etc.

Legal basis: Article 469 of the Civil Code of People's Republic of China (PRC): The parties may conclude a contract in written form, 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.