Abstract: The causes, composition, physical and mechanical characteristics of the hydraulicly filled mud are quite different for reclamation projects in various regions. The physical characteristics of the hydraulicly filled mud are studied by soil tests in laboratory, and studies of the sedimentation behavior of the hydraulicly filled mud are carried out by cylinder deposition tests, and the change behavior of strength and permeability of the hydraulicly filled mud with different water contents and void ratios are studied by laboratory tests, and the distribution behavior of water content and strength of the hydraulicly filled mud with different depths are studied by field tests. The analysis results show that: in the sedimentation experiments, the settlement speed is fast in the early (t＜118 h) sedimentation due to the soil self weight settlements, and the settlements, density, water content and void ratios change obviously. The hydraulicly filled mud in saline water settles faster than that in the fresh water, and the effect on accelerating settlement rate of the hydraulicly filled mud is not obvious by adding dispersant or flocculant. A good correlation relationship is obtained between mud strength or permeability and water contents or void ratios by semi-logarithmic ordinate representing mud strength and permeability. The water content decreases with depth, and the strength increases with depth. Change in water content and strength with depth is a little bit under different self-weight consolidation conditions in shallow layer, but more significant in deep layer.