In order to achieve the flight performance of high-speed variant vehicles with wide lift-to-drag ratio， a new aerodynamic layout of high-speed gliding variant aircraft with wide lift-to-drag ratio is proposed and its efficient modeling method is developed. The method is based on the UG secondary development platform and adopts two-dimensional B-splines to construct the parametric system of the high-speed glider-variant aircraft， and only 27 parameters are needed to complete the aerodynamic configuration design of the whole aircraft. Numerical simulations are carried out under conditions of a wide speed range （Ma=2.5—8.5）， a wide airspace （H=6—25 km）， and a wide flight angle of attack （AOA=0—10°）. The results show that the new variant vehicle can exhibit good performances in multi-situations， including the high-speed cruising with the lift-to-drag ratios higher than 4.7 when the wings are spread and Ma= 4.0─8.5， the low-drag gliding with the drag coefficients lower than 0.02 when the wings are retracted and the angle of attack is within 5° （reduced by 20%─30% from those with spread wings）， and different swept-back wing openings with a large adjustable range of lift-to-drag ratio from 0.3─4.7. The results also indicate that the wave-riding effect varies depending on the degree of the spillage between the upper and the lower surfaces of the fuselage， i.e.， the higher the spillage， the weaker the wave-riding effect. Thus， the strength of the wave-riding effect in the airframe flow direction can be decided by adjusting the opening of the swept-back wing， and the variant vehicle can fulfill various flight missions.