Abstract: According to the short service life, high cost and other problems of the toothed cutter applied to the present mine shaft Full Face dilling Machine, the pa per analyzed the conventional failure formations and the failure causes of the tooth, shell, bearing, seal and others applied to the tooth cutter.From the bearing structur e, seal structure, cutter shell base structure of the cutters around the drilling head, cutter shell casting technique and cutter assembling technique, the technical improv ement measures were provided.Thus the moving time from the pressure differential compensation piston to the bottom was improved from 306 h to 517 h.The hardness of the cutter tooth and cutter shell housing was improved from the HRC3741 to HRC5056.The sealing effect and abradability of the cutter was improved.The sudden earl y failure of the cutter could be eliminated.Therefore, the service life of cutter could be expanded, the drilling time could be reduced, the drilling efficiency could be impro ved and the drilling cost could be reduced.