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Many natural creatures have non-smooth body surfaces that offer naturally advantageous mechanical properties,such as resistance reduction,anti-sticking,wear-proofing etc.Previous studies have proven that diamond bit inspired by natural non-smooth structure possesses higher drill efficiency and longer service life.However,it is rarely reported that researches have been carried out on flow characteristics of bionic diamond bit.This study is to investigate flow characteristics and improve our understanding of the mechanism of bionic non-smooth diamond bit.In order to observe and measure the flow distribution patterns of bionic diamond bit,particle image velocimetry(PIV)was employed and the transparent wellbore simulation device was set up.