The accuracy of estimation of stripping mining ratio and stripping volume in surface mine directly affect the investment and design of the mine, the traditional estimation change control is insufficient in calculating the fluctuation of the terrain and coal seam, which caused the low accuracy of the calculation result. The modern computer simulation technology could set up mine geology model, simulating the fluctuation change of the terrain and coal seam. Stripping mining and stripping volume calculation of BARA Mine in Indonesia was taken as example, the two indexes were calculated precisely based on Krueger difference method, the technology improved the data accuracy and working efficiency by comparison and evaluation.