The flight characteristics of a folding wing aircraft are investigated and on this basis, a full-size folding wing aircraft is designed. The aircraft's modes and dynamic characteristics are analyzed by use of CAE software Abaqus. It is shown that when the folding angle is smaller than 90 degree, the wing's third and fourth order modes are of bend-torsion-coupled. Thus in the subsonic conditions, the wing would likely be in the flutter state. A folding wing aircraft model is designed. A number of flight characters are obtained by using the model, and it is shown that the focus point of the aircraft moves forward because of its high sweepback angle, thus the aircraft would be more stable.