The present invention relates to an auto discovery operate and administrator (ADOA) system, characterized in that the ADOA system includes: a Server and a Client, wherein the Server is composed of an NMS system, and is mainly used for automatically allocating an IP address and an administration VLAN to a newly installed device and guaranteeing the uniqueness and accuracy of an administration IP address in a network; and the Client is composed of an MAU device in which an ONU module of an EPON system, a CBAT module of an EOC system, a DC module of a remote meter reading system and an OR module of an HFC system are arranged, wherein the CBAT module, the DC module and the OR module actively acquire information about an MAC port of the ONU module and a port connected thereto, report the information about the MAC and UNI ports of the ONU module to the Server, and receive the administration address allocated by the Server; and the Client is responsible for organizing and registering a packet and sending same to the NMS system of the Server and receiving configuration data issued by the NMS system, mainly the administration VLAN and the administration IP address. The ADOA system of the present invention can solve the problems that the configurations in the EPON system, the EOC system and the remote meter reading system are complicated and errors are easy to occur in the manual configuration.