A new construction method of port facilities using dredged material is proposed. The proposed method (SG-Wall) is the combination of stabilization technique (S) of dredged material and geogrid (G) for quay wall (Wall). The target of the method is both new construction of a quay wall and renewal of existing quay walls with increase the water depth for large vessels. The authors conducted static tests and numerical analyses such as effective stress dynamic FEM (FLIP) to examine the behavior of the composite material of stabilized soil and geogrid. The tests results prevail that the proposed method is feasible to the practical construction field and the quay wall constructed by the method have a high seismic resistance. The authors also proposed the design and construction procedures of SG-Wall for steel sheet-pile type quay wall based on these results.