Legal analysis: the electronic signature law requires a valid electronic contract. Not all electronic contracts have the same legal effect as paper contracts. The Electronic Signature Law stipulates that "a reliable electronic signature has the same legal effect as a handwritten signature or seal". "Reliable electronic signature" requires (1) that when the electronic signature production data is used for electronic signature, it belongs exclusively to the electronic signer; (2) When signing, the electronic signature production data is only controlled by the electronic signer; (3) Any changes to the electronic signature after signature can be found; (4) Any changes to the content and form of the data message after signature can be found. In addition to meeting the requirements of reliable electronic signature, it also meets the requirements of the law on the original form and preservation conditions of electronic contracts. Generally, the electronic contract generated by the system or signed by e-mail has low probative power, and it needs to prove the authenticity of the signature and has not been tampered with, so the proof is more complicated.

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.