Abstract: In order to solve the problem of the short service life and low ROP of conventional PDC bit in heterogeneous hard formation, the plow-cutting PDC bit is designed and machined in this field application. This new mixed bit with PDC cutter as the main working components and conical PDC cutter as a secondary component breaks rock in cutting and ploughing, improving its shock resistance and rock-breaking effect in heterogeneous hard formation. Field test shows that the PDC bit can achieve higher ROP by 57.6% and higher bit footage by 91.6% compared with the conventional bit, and achieves great using effect. The new PDC bit has characteristics like high ROP, long service life and more footage, which is of great significance to the fast development and exploration of oilfield and reduction of drilling costs.