Abstract: As for the problem of the original design of the slope angle too conservative,in this paper,the stability of the slope was analyzed and calculated based on limit equilibrium analysis method and sensitivity analysis method.According to the result,combined with engineering practice the author has come to the conclusion that the slope can have more preferable slope angle and the optimum slope angle obtained.The studies the author having performed showed that the Mine production could not only do less extra workload but also can achieve great economic benefit.