Regarding the increasing scarcity of materials such as sand and gravel for the surface filling of soft soil sites，this study conducts laboratory tests on the solidification of soft dredger fill. The research uses unconfined compressive strength tests to compare the reinforcement effects of three curing agents under the condition of a low incorporation ratio. The results demonstrate that the strength of soft dredger fill increases significantly after solidification under the condition of a low incorporation ratio of three curing agents. The addition of compound activator and slag powder to cement can improve the strength of solidified soil，and the effect of slag powder is superior to that of compound activator. The replacement of part of cement with slag powder can further improve the reinforcement effect when the total incorporation ratio remains unchanged. Through the above laboratory tests for the solidification laws of soft dredger fill under a low incorporation ratio and feedback to the engineering applications，this study solves the problem of the scarcity of filling materials in the soft soil sites.