Aiming at the thermoelastic instability of dry friction elements,the system disturbance factors and system structural factors were unified through the method of combining theory and simulation calculation.From the perspective of the influence of the disturbance frequency on the critical speed,the thermal elastic instability analysis of the brake dry friction element was carried out.The study found that the system instability is related to the disturbance frequency,and the critical speed that causes the system instability has a minimum point,at which the system is most prone to instability.Excessive local thermal stress of the friction pair is the main cause of system instability.There is no inevitable connection between the overall temperature of the friction pair and the system instability.The proposed thermal elastic instability analysis method of dry friction elements based on the thermal-solid coupling disturbance boundary can be directly used to guide the structural design of the thermal elastic instability of the friction lining.