An access device, a system and a method for implementing service configuration are disclosed. The method includes: identifying, by an access device AN, an operation mode of a CPE according to a result of a handshake negotiation performed between the line port of the access device CN and the CPE, and selecting a corresponding preset service template according to the operation mode of the CPE, and then configuring the line port according to the service template selected, thereby implementing the self adaptation of the ATM mode and PTM mode of the CPE. With the technical solution of the invention, when VDSL2 service is provided, the service may automatically access subscribers of ADSL ATM mode and subscribers of VDSL PTM mode simultaneously, and an automatic configuration and management may be realized for all the service configurations in different modes, and thus the operation complexity may be simplified, and the operation cost may be lowered.