Abstract: Using a theory of critical slip field, which has been further modified to be adequate the sea embankment on soft soils, and considering the case history of a sea embankment landslide, a series of critical slip fields have been determined incombination with different c , and values of fills. The computed location of thecritical slip field is coincident nearly with the actual failure surface. Based on numerical modeling, the mechanism for landslide is analyzed an the stabilization measures are proposed. The result of analysis shows that the theory of critical slip field is rather effective for slope stability analysis and is deserved to be applied to practical problems such as those on soft soils.