This course is established for postgraduatestudents of Mechanic, Materials. In this course, soils in the seabed includingsandy soil and marine clayey soil are introduced, especially in the mechanicalbehavior such as consolidation, compression, shear behavior. Then, themechanical indexes and constitutive modelling of soils are presented in details.Finally, a new simplified method considering the coupling of consolidation andcreep will also presented. This course is helpful for students (a) tounderstand the mechanism of large slide deformation, shear failure in seabedsoils, (b) to analyze the seabed soil behavior systematically, (c) to providethe references or inspiration for the students with related research topics, (d)to make a basis for the jobs of civil engineering, structural design etc.