The invention discloses a certification scheme for an Ethernet Passive Optical Network (EPON) Access System, which comprises the following three parts: an applier system, a certifier system and a certification server system. The applier system requests the certifier system to access a network service, and responds to protocol message from a certifier; the certifier system controls the applier to access the network service, and during the course of certification, the certification request of requesters is transmitted into the certification server before authorization for the requester is executed according to instructions from the certification server; the certification server system is responsible for storing relevant information about users, implementing the function of the requester ID verification and demonstrating whether the requester passes the verification and is allowed to access the certifier network service. The invention resolves the problems of accessing certification, authorization and charging for the EPON accessing network system, which effectively strengthens the security of the network access, prevents illegal users from accessing the network, and ensures the network capabilities of 'Operation, Management and Increment'.