Abstract:Drainage in open pit is one of the key technologies of open pit mining, and it is also an important guarantee for orderly mining of open pit mine. The traditional optimization methods of pump drainage system in open pit mine is manual optimization basis on simple technical and economic comparative analysis, which is subjective to a certain extent. In order to overcome the defects in the optimization of traditional open-pit mine pump drainage system, takes the Fujiawu mining area of Dexing Copper Mine as an example,considering comprehensively the economic, technical, safety and time factors affecting the optimal selection of pump drainage system in open pit mine, this paper constructs a comprehensive evaluation index system for optimal selection of pump drainage system in open pit mine, and the comprehensive superiority degree of schemes is calculated by using the approximate ideal solution sorting method based on entropy weight, then obtained the order of advantages and disadvantages of each scheme, realized the optimal selection of the pump drainage system scheme, which provides a reference for the similar mines to solve the same kind of problems.