Abstract: The sea sand-mud mixture used as filling material is proposed. The strength parameters and compression performance and permeability of soils are compared and analyzed through laboratory tests with different blending ratios of the mixed soils. The results indicate that when the sea sand-mud is blended with mass ratio of 1.5: 1, its physical and mechanical properties are the closest to the engineering requirements. In order to improve the engineering properties of the mixture, cement is considered. A series of laboratory tests are performed to study the unconfined compressive strength, shear strength of solidified mixture. It is indcicated that with the increase of cement content, the unconfined compressive strength and shear strength of of solidified mixture are significantly improved, and there exists 7 d early strength. There is a peak value in the stress-strain curves of soils stabilized by cement with the cement content of 8% and 10%, and there is significant brittle fracture. The permeability coefficient has a significant reduction. Under the cement content of 6%, 28 d age solidified mixture belongs to the low-compression soils.