With the development of industrial automation technology, the monitoring system becomes more and more important in the control system. The paper discusses the monitoring system design based on the pump station for high press water. At first, the paper introduced the base process and the control system of the pump station for high press water. The control system includes two parts: upper part and lower part. The control network consisted of some PLC controls the device in the system. Then the method of the OOP technology application to the monitoring system design are emphatically introduced and discussed. Finally, the paper briefly introduced the main function models and the key technologies.