By using unsteady numerical simulations, this paper concentrates on the aerodynamic characteristics of a twoelement airfoil consisting of a leading edge droop nose, a trailing edge hinge flap as well as a largely upward deflecting spoiler during braked ground run. The results show three points: ①The upward deflection of the spoiler increases drag remarkably. The drag coefficient of the twoelement airfoil is beyond 0.33, which is much larger than those of general multielement airfoils (the 30P30N threeelement airfoil no more than 0.05). ②The total lift coefficient of the twoelement airfoil is always negative during its periodic oscillation. The droop nose, the main wing and the spoiler provide negative lift, while the hinge flap provides positive lift. ③There is a pair of shedding vortices on the upper surface of the hinge flap, which grow, shrink, disappear and regenerate, while floating downstream during the lift/drag coefficient period.