In order to analyze the pressure response rate during the pintle shift movement of the pintle motor, a 2D model is build for simulations with CFD software. Influencing factors on the the pressure response characteristics are identified, such as the drag force of the drive system and the friction coefficient of the dynamic seal. It is found that the drag force of the drive system, the pressure exponent, and the semi-cone angle of the pintle head would greatly affect the pressure response rate; the decrease of the friction coefficient under a high pressure could obviously reduce the friction force and thus increase the pressure response rate; the combustion temperature of the propellant only slightly influences the pressure response rate.