Abstract: Based on the in-situ tests of solidified mud casted under water and on land, the strength and deformation of the solidified mud and the bearing capacity of the casting foundation on two casting conditions are compared. Tests results show that the solidified mud casting foundation both under water and on land can meet the bearing capacity demands of the container yard of Yantian Harbor in Shenzhen city, and that underwater casting is favorable to the increase of the later bearing capacity of the foundation if the segregation between water and mud is controlled.