A typical soil slope is adopted to demonstrate the aim. The limit equilibrium method and Monte Carlo method are combined to calculate the system reliability. The research results have shown that the system failure probability based on the assumption of lognormal distribution func-tion is larger than that based on normal distribution function. This conclusion is also applied when the failure probability is calculated on the deterministic critical slip surface which has the minimum factor of safety. However,a significant difference between lognormal distribution func-tion and normal distribution function is noticed in the latter case.%利用Monte Carlo法与极限平衡方法相结合，针对一典型土坡，比较分析了正态分布函数与对数正态分布函数对边坡系统可靠度的影响，研究得出：相同均值与标准差的前提下，假定土体材料符合对数正态分布函数得到的系统失效概率较之正态分布函数假定下的系统失效概率要大，另外，若仅在确定性临界滑动面上进行可靠度分析时，对数正态分布函数假定得到的失效概率同样较之正态分布函数假定下要大，但是，其增幅要大于边坡系统可靠度分析时的增幅。
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