Taking the mosaic type mechanical seals as the research object,through the force analysis and heat conduction equation,the two physical fields of heat and force were coupled and solved,and the thermalmechanical coupling simulation model of the moving ring assembly of mechanical seals was established.The end face deformation of the moving ring component under different stress conditions and the joint surface contact stress and end face deformation under different interference were calculated based on the thermomechanical coupling model.The influence of the thickness of the moving ring on the end surface temperature field,stress distribution and end surface deformation was analyzed.The results show that the influence of thermal stress on the end face deformation is greater than that of structure stress,so the influence of thermal stress on mechanical seal components can not be ignored.With the increase of the interference of moving ring,the deformation of the end face and the contact stress of the joint surface gradually increase.With the increase of moving ring thickness,the highest temperature decreases,the highest temperature appears at the inner diameter of moving ring,and the end clearance changes from convergent type to divergent type.Therefore,when designing the mechanical seal structure,using a smaller interference and moving ring thickness can reduce the deformation of moving ring end face.