The programmable regulator is an intelligent regulator with microprocessors. There are many PID modules. It not only can complete an internal cascade to achieve four PID regulating output independently but also can do square root, temperature compensation, pressure compensation, and add, subtract, multiply, divide, broken line approximation and other computing functions. There are four sets of independent display control panel. You do not need to switch. It is suitable for petroleum, chemical industry, metallurgy, light industry and other industrial process automatic-control. It has the communication function and can form a distributed control system with monitoring computer.