Abstract: Based on the theory of floating cone exclusive and dynamic programming method， dynamic optimization of the staging scheme was used in open-pit mines. The optimal installment scheme could be obtained under the conditions of the different iron ore market by using 20 million tons of ore quantity as boundary increment to produce a series of geological optimal candidate boundaries by using cone elimination， and dynamic programming for the maximum of the net present value. The results showed that when the average price growth rate are 1.5%，3% and 4.5%， and the corresponding annual growth rate of production costs are 0.5%， 1% and 2%， the best scheme is divided into two stages and three stages. The economic net present value of the two stages of mining scheme is 1.2%， 3% and 4.3% more than that of the three stage mining scheme， but the amount of ore is 9.2%， 7.9%， and 13.1% less than that of three stage mining scheme. It can be seen that the net present value or the amount of mineral resources has a very important influence on the selection of the optimal scheme.

Key words: open-pit mine, phase mining, geological optimal sequence, dynamic programming, the optimal staging scheme