To study coupling effect of heat-fluid-solid in a spiral groove mechanical seal lubricated by magnetic fluid,the pressure distribution,temperature distribution of magnetic fluid film and deformation of rotating ring were calculated by ANSYS Workbench,and the effects of current intensity,rotating speed,and magnetic particle volume fraction on pressure,temperature of magnetic fluid film and deformation of rotating ring were analyzed.Results indicate that the pressure,temperature of magnetic fluid film and deformation of rotating ring increase with the increase of current intensity,rotating speed,and magnetic particle volume fraction.Near the inner radius,the temperature of magnetic fluid at the inner diameter is higher but the hydrodynamic pressure is lower,and the base fluid of magnetic fluid is prone to vaporization.The pressure deformation is far less than thermal deformation of rotating ring.The pressure and temperature obtained by numerical solution are larger than those obtained by analytical solution and experimental values,mainly because the effects of seal weir and centrifugal force on magnetic fluid film are considered in the numerical solution.