Abstract: The characteristics and performance requirements of PWR Pressurizers are analyzed, and the mathematical model for the pressurizer is optimized. The relationship between some thermodynamic parameters and temperature is linearly treated to get the optimization mathematical model of the pressurizer. Based on MATLAB environment, the dynamic simulation of the pressurizer is studied. The accuracy and real-time of the dynamic simulation is verified by the simulation for the mathematical model, and the dynamic simulation of the pressure safety system is achieved.