Abstract:   In view of the high cost and poor flexibility of the water quality parameters of marine ranching, a water quality monitoring ship with automatic cruise function based on GPS is developed. This ship uses Arduino microcontroller as the ship`s controlling module, combined with GPS positioning technology and wireless communication technology to achieve the ship`s automatic cruise function. The multipoint mobile measurement function of water quality parameters is realized by using a variety of sensor modules, Analyze and process the collected data to complete the transmission and release. The developed software is able to obtain the motion state of the ship in real time, view the track and position information of the ship, and send the control commands to the ship through the wireless network to achieve the effective control of the ship's hull. Monitoring ship greatly reduces the number of monitoring equipment at the same time improve the detection accuracy and detection efficiency, reduce the cost of monitoring, it played a positive role in promoting the precision of aquaculture.