Abstract: Based on the point estimate method and finite element strength reduction method,this paper calculates the reliability indexes of 4 typical cutting slopes in different loess regions.The results show that: the stability coefficient of case 2 is 1.46,but its failure probability is 19.2%; although case 1and 4are similar in slope type,the lithology and layer thickness,etc,the difference between their failure probabilities can reach 29.8%,parameter variation is the main reason of causing the difference.Using point estimation method to calculate slope reliability can be an appropriate way to solve the problem that soil parameters discreteness influences slope stability assessment.