Abstract：Many large highspeed landslides could fly in the air at the short-range stage. Highspeed sliding mass would bring about aerodynamic effect like the aerofoil. Based on the principle of aerodynamics，the aerodynamical effect is studied for the case of highspeed sliding mass flying in the short-range stage. The formula is educed for the flying parameters，including lift force，resitance force，flying time and distance in consideration of ground effect. The application of the formula to the Touzhai landslide in China gives reasonable results by comparison with the field observations. The calculated results illustrate that the lift force plays an important role in the motion of the sliding mass in the short-range stage，and the flying time is longer and the distance is farther than those without consideration of gound effect.
