Abstract: The bionics theory was applied on the spiral bits, and then a non-smooth spiral bit was designed and processed for carried out the problem of serious sticking. Experiments finally proved that the bionic non-smooth spiral bit has a significant effect in the area of desorption and reducing resistance, compared with the conventional spiral bit, the desorption rate and drilling efficiency have been enhanced 70% and the fuel consumption has been decreased 53.3%. So it is novel tool for drilling of large diameter spiral.

Key words: spiral bit, bionic non-smooth, reduce the adhesion, reduce resistance, convex hull