Abstract: The current production status of 6.00 mt / a in Liang Shui Jing coal preparation plant does not match with the current situation of 8.00 / a lifting capacity of coal mine, lump coal washing system and dust coal washing system, raw coal gangue yi, load saturation of coal slurry system, etc., taking into account the existing production status and industrial site conditions of coal preparation plant, combining with the requirements of product users on calorific value, in line with the principle of minimum impact on production and minimum investment, through optimizing the process of coal preparation plant, the processing capacity of each washing system can be fully utilized to increase the processing capacity of coal preparation plant..