Abstract: To improve the rock breaking efficiency and the service life of polycrystalline diamond compact (PDC) bit in the hard formation with strong abrasivity, two novel PDC-impregnated diamond insert hybrid bits, which are composed of PDC cutters and impregnated diamond insert as cutting units, are designed and tested in the quartzite formation of a fault block in central Hebei Province. Field tests show that the rate of penetration (ROP) of 1^# novel bit is increased by 52.30% and that the bit footage is increased by 97.30% compared with the average value of roller bits used in the same well section.It is also found that the ROP of 2^# novel drill bit is increased by 30.85% and 32.30% and the bit footage is increased by 70.50% and 47.40% compared with the average value of roller bit and M1375D PDC bit. In conclusion, PDC-impregnated diamond insert hybrid drill bit greatly improves the drilling efficiency of hard formation with strong abrasivity and reduces the drilling cost.