In geological drilling and oil and gas drilling， PDC bits have been used widely with good technical and economic results. However， PDC bits are often abnormally worn， and even broken， which influences their further popularization and application. Russian drillers studied this problem， and suggested that new generation PDC cutting elements be used to design a new structure bit. Some progress has been made with considerable technical and economic results. Therefore it has definite reference value for Chinese drillers.