Reliability problem for gravity retaining wall constructed by new engineering materials is researched by using Monte Carlo probability theory, and the reliability program diagram of retaining wall is designed. Reliability calculation is programmed base on the anti-skid and anti-overturning safety failure mode of retaining wall. On the basis of known the probabilistic characteristics of the random parameters such as wall dimensions, material parameters, external load, and so on, and the program can automatically calculate the anti-sliding and anti-overturning failure probability and reliability indices. The research content and compiled program provide convenient reliability calculation method for the design of actual retaining walls constructed by new engineering materials.