In the drilling operation in the Beibu Gulf Basin in the west of the South China Sea, the first spud uses milling cone bit and PDC bit, which requires two trips to drill to the first formation of Weizhou formation to meet the needs of lower surface casing. In order to solve the problems of low drilling efficiency and high capital cost, through the optimization of the design of the inserted cone bit, a strong-attack inserted cone bit suitable for this block is developed, which realizes one bit and one drill to the formation of Weizhou formation. The key technology of bit design is widely used in the drilling operation in Beibu Gulf Basin, which improves the drilling efficiency significantly. The research results can provide reference for the design and selection of drill bits for loose and hard interlocking formation and sandy conglomerate formation.