The PDC bit is the new type of bit with the characteristics of high wear resistance, high impact resistance, anti-ramps,anti-balling, high drilling rate. It has been proved by field using that have characteristics of high speed, fast headway,long life-cycle,steady working,less accident in well,best quality of well body. The PDC bits that we research and develop having reached more than 30 countries,which can satisfy the requirements of different strata.