Based on shear strength reduction finite element method, the influence of width of heel plate and toe plate, uniform load, height of retaining wall, parameters of filling on stability of cantilever retaining wall have been analyzed. It is indicated that the fractured surface is the boundary of “protected” and “unprotected” filling soil, which is essentially different with the second fractured surface of planar retaining wall. The stability of retaining wall increased with width of heel plate or toe board or distance of uniform load increased, and decreased with height of retaining wall or value uniform load of increased. It is advised to fill the retaining wall by the soil with low weight, big cohesive strength and big internal friction angle.