Abstract: Slime water treatment is the key technological process in coal processing production,but it also the link that frequently course problems for most of coal preparation plants.Based on the slime water characteristics,this paper analyzed the main reason of difficult to settlement and clarification of slime water,discussed the current situation and problems of slime water treatment technology,reagent,processes,equipment and other aspects in China,analyzed the main problem existed and presents the development tendency of slime water treatment technology.