Abstract: With the rapid development of industrial technology and robot technology,robot research based on the principle of bionics has become a hot project.Bionic robot fish has attracted the interest of many scientific researchers as an underwater vehicle.Now that a new era of global networking of the BeiDou Satellite Navigation System has begun,this paper proposes a bionic fish control system based on the BDS to realize the remote detection of water quality.The embedded control board STM32 as the main controller is responsible for receiving and processing data from various sensors.Based on BDS positioning,navigation,timing and two-way short message communication functions,it can realize autonomous swimming,obstacle avoidance,deep water quality detection and real-time data transmission to remote monitoring and other functions.This design can improve work efficiency and has good prospect for application.