By using numerical simulations, this paper concentrates on the aerodynamic characteristics of airfoils with a 20° upward deflecting spoiler as well as a hinge flap of different deflections, and makes a choice of flap deflection solutions suitable for roll control as well as airbrake of large airliners as an aid to spoiler. The results show two points: 1) As an aid to upward deflecting spoiler for roll control, deflecting hinge flap upward helps to create a larger roll moment while preventing unnecessary drag increment. 2) As an aid to upward deflecting spoiler for airbrake, deflecting hinge flap downward helps to achieve better deceleration while preventing unnecessary lift loss.