The temperature of seal ring ending face is an important factor affecting the performance of hydrostatic dry gas seal,which can directly represent the working state of seal.The temperature field analysis model of the hydrostatic dry gas seal ring was established by solving the heat transfer equation with finite element analysis software,and the temperature distribution and the characteristics of the seal ring end face under abnormal contact conditions and normal working conditions were analyzed.The results show that the temperature of sealing ring end face under abnormal contact condition is about 76.6% higher than that under normal working condition.The temperature of the seal ring end face slightly decreases with increase of film thickness,and the temperature of the seal ring end face significantly increases with the increase of rotating speed.The temperature of the end face slightly reduce with the increase of cavity pressure,and the temperature difference between the end face and the cavity increases with increase of cavity temperature.The influence of temperature field on sealing performance was analyzed.It is found that with the increase of temperature,the sealing opening force increases slowly,while leakage and stiffness decrease.The method of real-time monitoring of seal running state through temperature monitoring was proposed,and the feasibility of this method was verified by experiments.