Abstract: This paper method of quantitative analysis is based on empirical method, but calculation of producing costs further more to each link such as power cost, material cost, repair cost, labor wages, equipment depreciation costs and so on, also considered the differences in equipment production capacity caused by different mining system processes, so investment and production cost are calculated into the unit m3 of production capacity for comparison, in order to reduce human error in the design and to recommend real optimal solutions for guests. This paper analyzed the whole calculation process through a practical case, compared the differences between the traditional empirical method to the quantitative analysis method, highlighted the advantages of the quantitative analysis method, which has important reference and guiding significance for selecting mining system in opencast design.