Single metal seal structure of cone bit can prevent drilling fluid from entering bearing cavity and the leakage of grease,but single metal seal structure is easy to fail under high speed and high drilling pressure.In order to improve the sealability of single metal seal structure,the finite element model of single metal seal structure was established by using ABAQUS,the influence of the inclined angle and wedge angle of the static ring,the length of dynamic sealing surface on the contact stress of the dynamic sealing surface was studied.The results show that the maximum contact stress is increased gradually with the increasing of the inclined angle of the static ring from 13° to 21°,and the peak value appears at 0.5 mm outside of the dynamic sealing surface.During the change of the contact length of the dynamic sealing surface from 2.5 mm to 4.5 mm,the contact stress is increased gradually,but the change is not obvious.When the static ring wedge angle is increased from 1°to 9°,the contact stress is decreased,and the maximum value distributes outside the dynamic sealing surface.It can be concluded that the inclined angle of the static ring has great influence on the contact stress,while the static ring wedge angle and contact length of the dynamic sealing surface are relatively small.By using the orthogonal optimization experiment,the sensitivity of the sealing structure was studied and the optimal structural parameters of sealing structure were obtained.After the optimization,the maximum contact stress is increased by 62.72%,and the average contact stress is increased by 17.02%,the sealing performance of single metal seal structure is improved.