Abstract: In order to improve the efficiency of the screen-bowl centrifuge in dewatering of clean coal slime, following an analysis of the working principle of the centrifuge, a study is made on the optimization of the process flowsheet and operating parameters of the centrifuge. Study result shows that trash and oversize control screens need to be added in the process for avoiding damage of wiremesh of basket caused by entry of foreign matters and oversize particles in to centrifuge; the necessity of adding a secondary flotation system is determined by the ash value of concentrate; for ensuring the moisture of dewatered product is below 18%, the centrifuge is required to operate under the optimal conditions of having a proportion of > 0.25 mm particles in the feed exceeding 24%, a feed concentration of around 250 g/L and a proportion of coarser particles blended in centrifuge feed no less than 32%. Under such conditions, in addition to the effective formation of a compact filter bed in centrifuge, it is possible to obtain a finer dewatering classification size and make dewatering an recovery of both clean coarse slime and flotation concentrate.