There are a lot of white ore in Jixi Qingshan coal mine. Argillization of this ore is very terrible. This ore quickly turns to fine white slime in water and forms the stable suspending liquid. It leads that slime water form sediment is very terrible. This paper analyzed and researched the characters of the fine white slime water. The experiment results showed that the combined applied effect of MgCl2 and NPAM can enhance form sediment effect. The sample is the coal sample used in Jixi Qing Shan coal mine, which contains lots of white ore and is dipped in water for observation. This ore quickly turns to fine white slime in water, superfine, forming the stable suspending liquid. This suspending liquid become sedimentation in the natural placement for several days, which seriously effect the normal operation of the system of the manufacturing part of coal cleaning. This research on the sedimentation experiment of the fine white slime water will be introduced in this thesis.