Abstract: The final wall slope angle as an important factor affects the safety and economic benefits of open-pit mines, especially large deep open pit mine.Therefore, when ensuring the safety production of open pit mine, this paper analyzes the impact of various wall slope angle on ore-rock volumes, ore production quantities and economic benefits by optimizing the final boundary with different wall slope angles.The results show that the ore-rock volumes and ore production quantities of ultimate pits obtained by various steeping wall slope may increase or reduce, but the total economic benefits increase.