Tooth shape includes wedge-shaped tooth(X),wide top tooth(K),spon type tooth(S),conical-ended shape tooth(Y),hemi-spherical ended shape tooth(Y1),gage protection by diamond enhanced cutters on cone(F),flat diamond tooth(P).Different tooth types are selected according to different strata.strengthening of bits and inserts can effectively reduce the wear of tooth palms,improve the diameter protection performance of drill bits,and prolong the service life of drill bits in abrasive or directional wells or horizontal wells.