In view of the shortage of gravity caisson,a spatial frame composite pipe pile structure has been designed and studied.Through theoretical analysis,numerical calculation,conceptual design of engineering case,the advantages of the new structure are described.The wave force at extreme state is only 13.5% that of the traditional cylindrical caisson.The maximum reaction stress does not exceed 300 kPa.The structural lifting tonnage can be controlled at 1000 tons.Material weight is 10% to 25% that of the traditional caisson.The key members of the structure are prefabricated in the factory.