Legal analysis: after two or more parties reach an agreement voluntarily through equal consultation, there is no uniform format requirement for written evidence, but generally it is necessary to specify the personal information of both parties, the agreed matters reached through consultation, the way and time limit for performing the agreement, the liability for breach of contract, etc., and all parties shall sign and seal it for confirmation.

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.