Suction foundation is a new type of foundation for offshore construction. It's shaped like a tea caddy. It is penetrated by difference of water-pressure between inside and outside. Using suction foundation is useful for working term and constructing cost. Bearing capacity formula of suction foundation has been solved. But currently, it is a formula when the load is put on the center point. This study pays attention to the fact that it's quite probable that during the constructions loads can be put on the eccentric point. This study aims to solve the mechanism of ground movement when the load was put on eccentric point. Finally, the motion and the generating situation of the slide line on the model ground are observed.