High RPM and large pressure drilling parameters were usually adopted in the exploration drilling in Yemaquan mine of Qinghai. Since too much cuttings and heat are produced in the unit drilling time, the early failure of diamond bit is often caused by the abnormal wearing, and the construction schedule is seriously affected. The diamond bit was designed and the matrix formula and manufacturing technology were improved based on the geological and technical conditions in the field, the water outlet is appropriate widened. The results of numerical modeling analysis and field test show that the cutting removing, temperature and diamond bit service life are effectively improved.