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Tilting wing aircraft not only has the ability of vertical take-off and landing like helicopter, but also be provided with high speed cruise capability as traditional fixed-wing aircraft.Tilting wing aircraft is one of the hot spots of research in both military and civilian unmanned aerial vehicles.A new layout, tilt-tandem wing and quadrotor of vertical take-off and landing(VTOL)aircraft, is proposed to avoid the defects of low aerodynamic efficiency and complicated tilting mechanism.Conceptual design and aerodynamics simulation are carried out to analyze the aerodynamic characteristics of aircraft with the interference of propellers.Further more, prototypes are made and experienced several flight tests validation.Results show that this layout can avoid the disadvantages of low efficiency propellers and complicated tilting mechanism, which is reliable and practical.