Abstract: In order to realize the coal preparation plant of clean coal production,to meet the requirements of production and environmental protection,Production process of coal slurry treatment system in coal preparation plant has always been a focus to consider the link,according to the Chongqing white rock Songzao Coal Preparation Plant of coal slurry system in debugging process of the thickener,filter press squeezer long accident phenomenon,analysis of accident occurrence of all kinds reasons,and for reasons combining with the production practice to propose specific solutions scheme for coal preparation plant,appears to provide a reference for similar phenomenon.