The buildings with permeable but impermeablebottomare a new-type structure in offshore engineering. Compared tothe traditional hydraulic structures, this type of structure can flexibly adapt to the base bed without deformation and preventthe waves from entering the rear to cause damages. By constructing the physical model and testing in the wave flume, the action of irregular wave on anvertical building with permeable but impermeablebottom is measured,and the positive and negative wave pressure data at each measuring point are obtained at different water depths and same wave elements as well as at the time when the horizontal total force reaches the largest on the wave-facing surface and underside of the vertical building. In addition, the horizontal total force and the vertical force of the vertical building at different water depthsare compared and the distribution law of wave force along the surface of the verticalbuildingunder the actions of wave crest and trough is summarized. These can provide basis for the design of coastal engineering structures.