Polycrystalline diamond compact bits have been popular with the customers for the high drilling efficiency. However, the service life of PDC bits have been restricted by stratum, hole depth and temperature. In recent years, many researches were carried out on improving the performance of cutters by experts both in China and abroad and a lot of achievements were received. This paper mainly introduces 2 new technologies of Smith bits-CDE and ONYX 360 degree rotary cutter. The practical drilling experiment shows that the drilling efficiency and service life have been obviously improved by using these 2 cutters.