The present invention discloses a method for maintaining a base station, a device, and a system. The method includes: if a first operation and maintenance OM channel between a network management system NMS device and a first base station is in an interrupted state, determining, by the NMS device, whether a second channel between the NMS device and the first base station, sending, by the NMS device, an operation and maintenance command to the first base station through the second channel to perform operation and maintenance on the first base station. In the technical solutions of embodiments of the present invention, when the first OM channel is in an interrupted state, it may be not required to instruct operation and maintenance personnel to visit a site and perform an operation, so that costs of the site visit by the personnel are reduced, and a speed of response to a fault can be also increased.