边坡稳定分析方法很多，经典的极限平衡法并不能给出唯一的安全系数值而且复杂抽象；强度折减法虽然简捷实用，但无法反映出边坡失稳的机理。基于土工离心原理和极限平衡原理，提出了既简单直观又反映边坡失稳机理的坡角增大法，即通过不断施加增大的边坡坡角，增大下滑力，减小抗滑力，直至边坡失稳达到极限状态破坏为止，最终建立坡角与安全系数的关系。通过算例并与传统极限平衡法和有限元强度折减法相比，结果表明，坡角增大法在低地下水位边坡工程稳定分析中的应用是切实可行的，为边坡稳定分析提供一种新的研究思路。

 Slope instability is a complex problem in road and bridge  engineering, hydraulic engineering,and construction engineering. The mechanism of slope instability has long been an important content of geotechnical engineering research. Nonetheless, among various slope stability analysis methods, traditional limit equilibrium method is complicated, nonobjective, and cannot provide the only safety coefficient ； while the convenient and practical strength reduction method can not reflect the mechanism of slope instability. In this paper, a simple and intuitive slope-angle-increasing method which reflects the slope instability mechanism is proposed. This method is based on the principle of geotechnical centrifuge and limit equilibrium and is demonstrated by example calculation. The method is to increase the slope angle gradually so that the sliding force is increased and the anti-sliding force is reduced until the slope instability reaches its limit and slope failure happens. In this way, the correlation between slope angle and safety factor can be deduced. The method is demonstrated by example calculation and the result is compared with that of traditional limit equilibrium method and finite element strength reduction method. The comparisons show that slope-angle-increasing method can be applied to slope projects of low groundwater level ， and offers a new research idea for slope stability analysis.