Abstract: It is necessary to replanning coal preparation plant by analyzing present situation of three coal preparation plants in Wuda mining district; two plans including modification on upgrading original coal preparation plant and constructing new central coal preparation plant are proposed and studied,then technical and economic indexes of these plans are analyzed. The results show that it is more reasonable for integrating Wuda mining district to build a new 4. 0 Mt/a coal preparation plant,which can not only increase yield of clean coal,downsize staff for efficiency,but make original coal washing technology perfect,promote level of safety civilization production in coal preparation.