According to the inquiry method, the electronic contract signed on the nationally recognized electronic contract platform (www.fadada.com) has legal effect. There are many ways to confirm the legal effect of electronic contract in judicial practice, among which the certificate issued by electronic certification authority, namely digital certificate (CA), is the most widely used. Because the production process of electronic signature needs to be realized by issuing certificates, and the electronic certification institution must obtain the electronic certification service license issued by the Ministry of Industry and Information Technology, the court can inquire and confirm it through the website of the Ministry of Industry and Information Technology. It can be seen that the electronic contract signed must have the business license of the Ministry of Industry and Information Technology and the electronic certification service license.