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In study on pressure casting control system of the complex thin-walled part, in view of the complex thin-walled part pressure casting system model, the method of pressure control in the process of pressure casting is studied. Using PID, dynamic matrix control, PID+DMC three kinds of control algorithms, simulation results show that three kinds of control algorithms can achieve the control of pressure casting system; Among them, the PID+DMC algorithm has better dynamic performance, and it also has a good control effect on the model mismatch problem in the pressure casting system, with a strong robustness.