Abstract:According to the design theory of composite pile foundation,the simplified design method of composite pile foundation with sleeper is presented based on the engineering practice in Nanjing. In this design theory,the ultimate bearing capacity of single pile is adopted in friction pile groups with large pile spacing and low pile cap,and the loads acting on the composite pile foundation are distinctly shared by the piles and the soil under the cap. The design method is simple,convenient and efficient with promising prospect of employment.