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Layered soils are a form of the natural soil structure with some special soil physical problems such as the wetting front instability and the finger flow. Much attention has been paid to the predict of the behavior of wetting-front instabilities and the wetting front width. Although the water entry suction has been studied, the method to estimate the water entry suction through soil physical properties is still not developed. The water entry suction is only a function of the sublayer physical properties of the layered soil, hence it should be a function of the water retention curve and the capillary conductivity of the sublayer. Baker deduced the model to estimate the water entry suction. In the paper, a method is developed to estimate the water entry suction based on the capillary conductivity and compared with the method developed by Baker.