The embodiment of the invention provides an aircraft and a design method thereof, and relates to the technical field of aircrafts, the aircraft comprises an aircraft body, an air
inlet channel and two hang gliders, the air
inlet channel penetrates through the bottom of the aircraft body, the two hang gliders are arranged on the two sides of the aircraft body respectively, when the aircraft flies in the forward direction, the aircraft is in a
cruise mode, and when the aircraft flies in the forward direction, the aircraft is in a
cruise mode; and when the aircraft flies reversely, the aircraft is in a gliding mode. The aircraft body is provided with the air
inlet channel and the two hang gliders, when the aircraft flies in the forward direction, air enters the air inlet channel in the bottom of the aircraft body, cruising flight is conducted through
stamping power, and the aircraft is in a cruising mode; after the aircraft rotates around the center shaft to a reverse rotation state, the aircraft glides in a
high lift-drag ratio unpowered mode and is in a gliding mode. In the flight state of the aircraft, the cruising mode and the gliding mode can be switched at any time through attitude switching, the defects of weak
carrying capacity of the cruising mode and the dynamic defect of the gliding mode are overcome, and the dynamic
advantage of the cruising mode and the carrying
advantage of the gliding mode are considered.