Analyze and set up the dynamic mathematical model of tube and shell heat exchanger to difference instead of differential model of the digital based on material balance and energy conservation, through configuration chopped control software scripting language to compile the dynamic real-time simulation program of tube and shell heat exchanger and to simulate the heat transfer in the process of each process parameter change of heat-exchange terminal temperature influence, for heat exchange field engineering of the actual working process of the research of control circuit and parameters adjustment has certain guidance and reference significance.