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In order to obtain the optimal values of the operating parameters of the new ceramic membrane, on the basis of analysis of the structure and working principle of the ceramic membrane, the overall plan of the control system and the hardware subsystem and software subsystem are designed severally. A method was presented to achieve accurate control of differential pressure and flow through three loop expert PID control algorithm. Control system was designed with PLC for main controller, touch screen as the upper computer, pressure transmitter, flow transmitter and temperature transmitter for feedback device and electricity-controlled ratio valve for actuator. Running results show that when the value of the feed liquid pump outlet flow and circulation pump outlet flow are set, tracking error is within 5%, when the simulated import and export differential pressure value of ceramic membrane loop is set, tracking error is in 3.3%, and the system has the virtue of high control precision and good robustness.