To explore the influence of the displacement load of the driving sleeve on the contact stress of the seal flange，a mechanical model of the seal assembly was constructed，which can directly describe the stress of the seal body.Taking the outer flange as an example，the influence of different displacement loads on the contact stress of the flange of the seal body was studied by using ANSYS finite element analysis software.The results show that the contact stress is increased with the increase of interference amount when the width of ring groove and the radius of flange remain unchanged.When the width of ring groove and the radius of flange remain unchanged and the radius of flange is 3.5 mm，the contact stress reaches the minimum value.Under the same radius of flange，the contact stress is increased with the increase of displacement load，and the increasement tends to rise.When the flange radius and interference amount are constant，the contact stress is decreased gradually with the increase of the ring groove width，and the decreasement is relatively small.When the ring groove width is the same，the contact stress is increased uniformly with the increase of displacement load.The research results can provide theoretical guidance for the design of seal structure and the determination of displacement load.