The research discussed focused upon the optimal airfoil shape design of a heavy amphibious aircraft.A new airfoil with better general performance was attained through the optimal airfoil design

of which the objective was to reduce the drag coefficient on a given airfoil with constant lift coefficient.Restricted the pitch moment

the maximum lift

and the lift drop rate of stalling angle.Made the relative thick

the maximum camber

and the relative position of the maximum thick according with the design request.This design method is fit for the airfoil design on a heavy amphibious aircraft

and is a better optimal airfoil shape design which is suit for the engineering application.