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Proportional valve is an important component responsible for flow control in the inspiratory module of the ventilator. In order to study the characteristics of the proportional valve and improve the flow tracking effect of the inspiratory module of the ventilator, the relationship between the displacement of the valve core and the flow of the proportional valve is deduced, and the controlled object model of the proportional valve is constructed, and the model is realized in Simulink by using S-Function. The transient and steady characteristics of the proportional valve can be obtained by simple input control of the model. The response speed of the proportional valve can be improved by PID control and fuzzy PID control. By using the same parameters in the two control methods, the flow tracking effect of the two methods is compared under the Simulink simulation and experimental conditions, which can verify that compared with the fixed parameter PID control method, the fuzzy PID control method can effectively reduce the flow overshoot, so as to maintain the stability of the flow in the gas path.