Abstract: It has important scientific value to develop the buoyancy-lifting airship with higher aerodynamic efficiency. The new type tandem buoyancy-lifting airship, based on the NACA aerofoil, has considerable volume efficiency and aerodynamic efficiency. In order to examine the utility value and economy benefit at the design load condition，the buoyancy-lifting characteristics of tandem configuration in stratospheric platform are studied. Furthermore, its total performance and technical parameters are analyzed. Tandem buoyancy-lifting airship has excellent performance and utility value. As a result, its deadweight is decreased and payload and specific productivity are increased with smaller cost. Therefore, it is not advisable to overly pursue the minimization of drag. Contrarily, we need to seek a compromise between low drag and small dimension.