According to the requirements, a supervisory control system of Geotextiles-laying Vessel based on the OPC and Ethernet was designed. At the development of communication program between Geotextiles-laying Vessel automatic supervisory Control soft and PLC control systems, OPC server is configured and the universal OPC client program is developed to realize the reading data from OPC server. the detailed development of universal OPC client program is introduced. After the practice geotextiles-laying vessel supervisory control system’s application, the developed program runs reliable, and the data access has a character real-time.