Aiming at the low efficiency of horizontal directional drilling in hard formation， the self-sharpness of the bit was improved by the hard brittleness of FeCoCu pre-alloy matrix and the hard silicon carbide particle to weaken the matrix. The layered structure design is used to alternate the high and low wear resistance layers along the radial direction of the bit. The thickness of low wear resistance and high wear resistance were designed to be 1.0~1.5mm and 2.5~3.5mm respectively， to realize simultaneous wear of high wear resistance layers and low wear resistance layers and improve drilling efficiency. The bits have been successfully applied to horizontal directional drilling in hard potassium feldspar granite formation， using the combination of FeCoCu pre-alloy matrix and stratified matrix structure， with the average ROP of 0.8~1.5m/h and the drilling life of 30~40m. Compared with the ordinary concentric sharp tooth bit， the ROP has been increased by about double， and the drilling life has been increased by more than 30%.