Abstract: Slime treatment system is an important unit to make more innovations in coal preparation plants in China. There are more valuable practice experiences in variant technical innovations for slime treatment system in coal preparation plants to decrease new water consuption and pollution and to increase coal preparation efficiency. The paper summarizes some typical slime treatment flowsheetes and conditions to get with them, and expands on causes and measures of technical innovation for slime treatment system in coal preparation plants and on getting economic and social results by some samples. It provides some practical methods and measures for slime treatment system innovation in coal preparation plant in futher.