High lift can be obtained through circulation control to improve short take-off and landing. In this paper, the concept and theory of circulation control are presented. The influence of different momentum coefficients and angle of attack on the lift, drag and boundary separation is investigated through CFD method.The methods include Reynolds-Averaged Navier–Stokes Equations, SST turbulence model and velocity inlet condition at jet boundary. It is revealed that the lift augmentation reaches to 327% and ΔCy/ΔCμ=21.97 at α=0° and Cμ=0.05. The stall angle of attack becomes smaller with the increase of momentum coefficients, which is caused by boundary separation at the leading edge. The excellent aerodynamic characteristics are obtained at moderate momentum coefficients and small angle of attack.