Abstract: A commercialized complicated real-time control system must not only have process monitoring, control and data management abilities, but also have a friendly environment for users to develop their own control strategies and operator graphics. A software system that integrates the above functions must be very complicated, and the key point for implementing such a system is a good software structure and its realization method. In this paper, a client-server architecture for a complicated system is described, and the OOP realization method is presented.