Abstract: On account of the phenomenon that the drilling footage is low when diamond bit is used to drill hard compact abrasive rocks, SiC particles are added into matrix as abrasion-weakening particles. By using lab drilling and orthogonal test, the performance of bit was optimized in the aspects of diamond size, concentration of abrasion-weakening particles, hardness of matrix. The influence of drilling technological parameters on drilling efficiency was discussed. The results showed that adding abrasion-weakening particles with proper texture into bit matrix can enhance drilling efficiency and avoid bit slipping; the optimal designing scheme of the test was hardness HRC 25, diamond particle size 40/50 mesh, diamond concentration 55%, abrasion-weakening particle concentration 30%; at the same spindle speed, axial compressive force should not exceed 3.5 MPa. Under the same axial compressive force, the apropriate spindle speed isd is 750 to 850 r/min.