Deep geological survey and exploitation of deep mineral resources are carrying out in China, and the 13th five-year plan sets the research on the exploitation and utilization of underground space, which are inseparable from deep drilling. The rocks encountered in deep drilling are mostly anisotropic ones; borehole is easy to be deflected in this condition, which affects the penetration rate and drilling quality. The related research has been carried on by Russian Professor Скоромных В.В. and some others, a new design idea of diamond bit with waterway of different sizes is proposed. The comparative experiment results show that the technical indexes of this new bit are better than the old diamond bits with standard waterway sizes, and this technology is worth while researching and discussing.