Abstract: This paper has taken the character of unsaturated soil strength of garbage filling –burying body into consideration,and carries on the reliability analysis of the slope of garbage filling-burying body on the basis of the strength reduction FEM.Considering the physical mechanics indexes'variability of the garbage filling-burying body,this paper has calculated the overall reliability index of the garbage soil slope with FOSM.The result indicated that the variability of cohesion C and internal friction angle are in a greater impact on reliability.