The piled beam-slab foundation is a new type of foundations for the wind turbine on land. The bearing capacity and the ability of deformation control of the piled beam-slab foundation are as good as those of the traditional pile-raft foundation. Compared with the traditional pile-raft foundation or the gravity foundation, it is popular for its great advantage in cost savings. Unfortunately, the piled beam-slab foundation is still designed according to the design method for traditional pile-raft foundation since now, which leads to a waste of money. In order to develop a reasonable design method for the piled beam-slab foundation, a large-scale model test is carried out to study the deformation characteristics and the mechanical property of the piled beam-slab foundation under vertical load. The study shows that the behavior of the piled beam-slab foundation system is elastic under the working load. A significant differential settlement occurs between the centre and the edge of the foundation. The pile-pile interaction and the pile-soil interaction which are not considered in the present design method have significant impacts on the behavior of the piled beam-slab foundation. Thus, it should be considered in the future design.