Abstract: For the slipped soft soil foundation in the storage yard of a wharf, the root pile-net composite foundation is used. The centrifugal model test are carried out to study the effects of cushions on the bearing behaviors of single root pile. The bearing deformation difference of single pile between the centrifugal model tests and the field static loading tests is compared and analyzed. The test results of the vertical ultimate bearing capacity of single pile are compared with the calculated ones by the China's code method. The results show that the cushions have significant effects on the ultimate bearing capacity of single root pile which is the largest under reinforced cushion layer, followed by sand cushion layer and non-cushion. There are obvious differences between the Q-S curves of the centrifugal model tests and field static loading tests. The ultimate bearing capacity of single pile of the centrifugal model tests is greater than that of the field static loading tests. The calculated values of the vertical ultimate bearing capacity of single pile are lower than those of the centrifugal model tests and the field static loading tests.