Recently the aircraft is become smaller, interest in research on airfoils suitable for the low Reynolds number has become increasing. In this study, analyzed the aerodynamic characteristics of Kline-Fogleman airfoils and wings with those moer efficiency at low Reynolds number. It was found that lift to drag ratio is enhanced in the range of Reynolds number below 2.4 × 10<SUP>5</SUP>, especially, can be improved up to 26% at Reynolds number is 1 × 10<SUP>4</SUP>. It was confirmed that the most advantage case in terms of lift-to-drag ratio is Middle case and lift-to-drag ratio is improved to 20% at 80% of the wing area is Kline-Folgeman airfoil. At this time, endurance time increase to 12%. Also taking the structural stability of the wing and lift-to-drag improvement into account, designed to be from 50% to 80% the size of the Kline-Fogleman Airfoil would be advantageous.