Aiming at the problem of the change vibration mode of the quartz crystal resonator under the influence of the external forces.A model of quartz crystal is constructed by finite element analysis code ANSYS.Based on Mindlin’s vibration theory and the transverse force-induced mode shapes are derived.The results show that vibration displacement and vibration direction of quartz crystal are changed under the influence of external force.The research has important meaning in development and application of the pressure sensors and quartz crystal microbalance.