Slope protection works are often used on the surface of slopes of road and railway embankments, in order to prevent from seepage of rainfall and erosion. However, the effect for the reduction about water content has not been clarified by experimental and numerical studies. In this paper, the measurement of the water content in the test embankment with the leaking isolation sheet was conducted. From the comparison of the measurements with the presence and absence of slope protection works, it was revealed that the slope protection works played a role for prevention from seepage of rainfall.