In view of greatly heterogeneous lithology， poor drillability， low mechanical drilling efficiency and short service life of the bit in the massive gravel layer of the Bozi Block， Tarim Oilfield， a new surface impregnated diamond bit for the high-speed turbodrill is designed and studied from the aspects of the blade structure， central strengthening， multi-stage surface impregnated synthetic diamond formula and separate sintering process. The average ROP of the bit is 2.01m/h with the service life up to 300m， which is equivalent to that of the imported impregnated diamond bit， while the cost is far lower than that of the imported bit. The new bit greatly improves the construction efficiency of exploration and development of the formation and reduces the exploration cost.