In order to study the vibration state of AT?cut quartz crystal resonators under different temperature environments, the vibration displacement distribution of quartz crystals along the x direction at different temperatures was analyzed using the finite element simulation software COMSOL Multiphysics 6.0. The vibration displacement of parasitic modes was visually observed and the energy ratio and quality factor of electrode region at different temperatures were calculated. The quality factor and temperature frequency effect of AT?cut quartz crystal at different temperatures were measured experimentally. The simulation results show that the typical energy trapping effect always exists on the surface of AT?cut quartz crystal with the change of temperature, and the coupling between modes is not aggravated. The experimental results show that the variation trend of AT?cut quartz crystal frequency with temperature is consistent with the theory, and the experimental data and the quality factor calculated by simulation have no obvious change with temperature. The research results show that AT?cut quartz crystal has good thermal stability and can be used as the sensitive element of Quartz Crystal Microbalance (QCM) sensor in high temperature environment, which has guiding significance for the selection of sensitive devices in high temperature environment.