When the mechanical seal of a ships stern shaft is in operation,the temperature distribution and thermal deformation of the end face of the seal ring have an important effect on the sealing performance.In order to improve the stability of the mechanical seal,the temperature field and thermal deformation of the dynamic and static rings of the mechanical seal was analyzed by using the integral method and the separation method based on the finite element analysis software.The results show that the maximum temperature of the mechanical seal end face appears in the middle of the contact area,the temperature is gradually decreased from the highest point to the two ends,and the temperature at the outer diameter is higher than that at the inner diameter.The contact temperature of the mechanical seal end face will increase as the spindle speed increases.The thermal conductivity of the seal ring also affects the end face temperature,and the higher the thermal conductivity,the lower the maximum end face temperature.