Disclosed in the present application are a method and system for modifying in stages each stage of the period of validity of an electronic certificate, the method for modifying in stages each stage of the period of validity of an electronic certificate comprising: a client terminal sends a certificate issuing request message to a server; the server sends a certificate pre-issuing message comprising data for the client terminal to modify in stages each stage of the period of validity of the electronic certificate; the client terminal receives the certificate pre-issuing message, and respectively modifies each stage of the period of validity of the electronic certificate, and sends to the server a certificate pre-issuing feedback message comprising the modified stages of the period of validity of the electronic certificate; the server receives the certificate pre-issuing feedback message, and on the basis of the certificate pre-issuing feedback message, issues and electronic certificate. The present invention e
