According to the current development needs of offshore aquaculture in China,an intelligent monitoring and aquaculture system for offshore water quality based on Beidou positioning system is designed.This system includes static buoy monitoring station,water quality monitoring ship and unmanned aquaculture ship.Static buoy monitoring station and water quality monitoring ship are re-sponsible for collecting and transmitting water quality information,Beidou positioning system guides water quality monitoring ship to collect information according to route planning.After receiving the water quality information,the unmanned aquaculture ship relies on the Beidou navigation system to carry out aquaculture activities in the target waters.The unmanned aquaculture ship is equipped with double modules,which can accurately feed and control water pollution,greatly reduce the waste of feed and medicine,and realize green and efficient mariculture.The system solves the problems of high labor intensity,low production efficiency,unsuitable feeding area and slow response speed,which makes offshore aquaculture more intelligent and convenient.