The invention provides a method, a device and a
system for adjusting the coverage area of a
base station. The method for adjusting the coverage area of the
base station comprises the following steps of: acquiring a
throughput rate of a sector; if the
throughput rate of the sector is more than or equal to a
heavy load threshold, acquiring a step value for adjusting downtilt or a transmitting power of an antenna of the sector according to
signal quality data which is reported to the sector when a terminal switches the base state or according to a pre-stored reference data table; sending a first adjustment command which carries the step value to the
base station to which the sector belongs, so that the base
station can adjust the downtilt or the transmitting power of the antenna of the sector according to the step value after receiving the first adjustment command, and the coverage area of the base
station is adjusted. By the method, the device and the
system, the size of a coverage overlapping area of the base
station and an adjacent base station is guaranteed, so that terminals which are positioned in the coverage overlapping area can enjoy
normal voice service and data service, the phenomenon of unsuccessful switching or ping-pong switching is avoided, and the
communication quality of the terminals in the coverage overlapping area is improved.