Abstract: In order to control the working state of floating self-powered breakwater and the collected water quality information, a communication system based on BDS is designed. This system aims to improve the protection of aquaculture net cage and monitoring the water quality around the cage.This communication system uses the RDSS mode of BDS, adopts customized data communication protocol, locates the breakwater position in real time, then transmits the information collected by various sensors and user instructions. Combining with shore-based server or workstation, the real-time and all-weather monitoring of the breakwater is realized, and the controllability of the floating self-powered breakwater is improved.