The electronic signature of Shanghai construction industry can't be done on other people's mobile phone WeChat. When applying for a digital certificate, the applicant pays attention to the official account "CIACFWH" of WeChat via mobile phone, and clicks "Electronic Signature" in the "Micro-application" menu to apply for a personal digital certificate. When applying for a digital certificate, the handwritten signature must be uploaded synchronously, so as not to affect the registration application. In order to prevent subsequent problems, applicants can only apply on their own mobile phones. Therefore, the electronic signature of Shanghai construction industry cannot be done on other people's mobile phone WeChat.