An amphibious large aircraft without traditional airstairs is disclosed. With its flat and oblong fuselage, said amphibious large aircraft has wing-in-ground effect in addition to generating elevating force in flight. Thus, said amphibious large aircraft has smooth takeoff and touchdown on the runway as well as on broad water area. The flight efficiency is increased by 30-40%. The fuselage has only one floor, wherein the passenger cabin is set in the front of the fuselage, and the cargo hold is mounted above the rear. The wings are extended towards two sides from upper side of the fuselage. A jet engine is mounted above the rear of the fuselage and adjacent to the tail wing. Passengers can go on and off the amphibious large aircraft directly without the need of airstairs and can escape from the aircraft directly without the need of an inflator slide during an emergency.