In order to study the effect of elastic modulus e, to the safety factor and slip plane of slope, a numerical model is founded in plane strain mode for homogeneous soil slope.

This study shows that for improving development effect in the cyclic flooding, order of roles played by various forces are: capillary force, elastic force, while gravity plays no part in it basically.

A new optimizing algorithm is also proposed for the model, which, using the scalar effect of elastic problems, reduces optimizing variables by one and achieves stable results.