The contract sealed by fax is valid, but once a dispute occurs, it is difficult to prove the existence of the contractual relationship only by fax contract. It is recommended not to conclude the contract in this way in practice. From the perspective of evidence effect, if the other party faxes the sealed contract, the other party only gets a fax copy, and from the perspective of evidence effect, it is only a copy. If a dispute arises during the performance of the contract, and the other party denies the validity of the contract, and there is no other evidence to prove the content of the contract, the court usually will not accept the fax.
 Article 469 The parties may enter into a contract in written, oral or other forms.
 The written form is the form in which the contract, letter, telegram, telex, fax, etc. can tangibly express the contents contained.
 Data messages that can physically represent the contents contained and can be accessed at any time by means of electronic data exchange, e-mail, etc. are regarded as written forms.