According to the Contract Law of People's Republic of China (PRC), contracts can be concluded in written form, oral form or other forms. Wechat is an electronic communication tool, which can express meaning in written form. At the same time, according to the Electronic Signature Law of People's Republic of China (PRC), an electronic signature has the same legal effect as a handwritten signature or seal. Therefore, if the buyer and the seller conclude a contract through WeChat, and both parties clearly agree on WeChat, then the parents agree that the contract signed by WeChat is valid.