A timesharing control system contained liquid level,temperature and flow control based on ProfibusDP fieldbus was proposed, aiming at the limitations of singlevariable control of traditional process control system. The system was designed by using S7315PLC as the master control unit, S7224 as the slave control unit, PC and touch screen as the upper computer, to realize a real-time monitoring onthespot operation, and to complete parameters modification and centralized management, to help experimenters examine conveniently. After transformation, the system has been put into use. The actual operation shows the control system has the qualities of good opening and high integration, and meets the higher educational requirements.