The water depth of a deepwater breakwater is 18～30 m,and the soft soil layer is more than 30 m.In order to test the foundation stability and foundation settlement of the design scheme for the excavation of the slope embankment,the experiment of the soft soil foundation centrifugal model was carried out.The experimental results show that the resistance partial factors of circuler sliding foundation is 1.19,which is consistent with the stability result according to the specification.The settlement amount of the foundation is about 50% of the total settlement amount,and the test value seems to be small.The experiment verifies the feasibility of the design scheme.