① Method 1: You can log in to E-sign official website to upload a PDF document for inspection, and quickly feed back the real inspection results; ② Method 2: PDF engine technology based on Fuxin's independent intellectual property rights supports the third-party CA to expand it. Because the electronic signature of e-sign treasure uses the CA certificate issued by domestic CA, before using Fuxin reader to verify the validity of electronic signature, it is necessary to import the CA certificate into the information link of Fuxin reader. ③ Method 3: Because Adobe Reader is an international application, the certificate issued by domestic CA institutions is not in the certificate trust link of Adobe Reader, and because the electronic signature of electronic signature uses the CA certificate issued by domestic CA, it is necessary to import the certificate of domestic CA into the trust link of Adobe Reader before using Adobe Reader to verify the validity of electronic signature. The electronic signature administrator of the expedition report can enter the PC-side electronic signature-evidence center to download, and can provide third-party electronic evidence reports, notarial certificates and judicial expertise reports.