Recycling of dredged soils as construction materials is experimently discussed in this paper. The strength of light-weighted soils(LWS) consisting of expanded polystyrene(EPS), dredged soils and cement is characterized by uniaxial and triaxial compression tests with varying initial water contents of dredged soils, the EPS volume and cement contents, and expanded ratio of EPS. Test results show that the strength of light-weighted soils increases with adding cement contents, whereas the strength increases with decreasing initial water contents of dredged soils and expanded ratio of EPS. It was, however, found that increasing the EPS volume makes a lower the strength of light-weighted soils.