The invention discloses a method for stabilizing a vehicle running at a high speed, which is mainly characterized in that the structure comprises a drainage tube and a cross rod, wherein the drainage tube is installed in a column B of the vehicle; an air inlet of the drainage tube is positioned on a chassis of the vehicle; an air outlet of the drainage tube is positioned at the top of the vehicle; the cross rod is horizontally fixed in the drainage tube; two semi-circular light sheets are installed on the cross rod; the sheets are movably connected with the cross rod; support rods are installed below the sheets; and one ends of the support rods are fixed on the cross rod, and the other ends of the support rods obliquely and upward support the sheets. The method disclosed by the invention has the beneficial effects that when the vehicle runs at a low speed, the air lift between the bottom and top of the vehicle can not be influenced by the drainage tube, thereby avoiding the influence on vehicle acceleration and preventing energy sources from being consumed because the air lift is reduced and the friction between tires and the ground is increased; and when the vehicle runs at a high speed, the sheets are jacked up, the drainage tube is penetrated, and the air pressure of the bottom of the vehicle is reduced through the drainage tube so as to achieve the aim of reducing the air lift to increase the road holding of the vehicle, so that the vehicle is steadier when running at the high speed.