Drainage measures for embankments against rainfall are different during construction and after commencement of use, and the effects are sustained intermittently from the start of construction to after the commencement of use. Of the rainfall over this span of time, it is considered that embankments are undermined internally by the effects of the rainfall during construction. However, as the dates of construction of embankments cannot be determined and the amounts of rainfall sustained during construction are varied, the effects of rainfall on the initial stress conditions upon the completion of embankments have not been clarified. In this study, soil/water/air-coupled F.E. analysis was used to perform analyses of embankments which take into account compaction and the history of rainfall/evaporation, and a comparative study is made of the effects of differences in the amount of rainfall during construction on the initial stresses inside embankment.