In order to find out the interaction mechanism, influence law and the lift augmentation efficiency of the plasma circulation control on airfoil aerodynamic characteristics,the influence law of different trailing-edgeradius, single actuator position and arrangement mode of doubleactuators on the airfoil aerodynamic characteristics and flow field characteristics is investigated, by adding the equivalent volume force to the Reynolds-averaged Navier-Stokes equations. The result shows that the lift augmentation efficiency improves markedly by using the optimized medium trailing-edge radius model and applying two groups of plasma actuators reversely arranged on the upper and lower surface. The research shows that the profile with medium trailing-edge radius is comparatively good in lift enhancement effect because its centrifugal force and pressure gradient are balaced ,and the plasma actuation jet drives the upper surface outflow deflected by guiding the couple of shed vortex moving to lower surface.The optimized double plasma actuators can make plasma actuation jets cascade , guide the couple of shed vortices moving to lower surface, and push the separation point down,thus causing the obvious behavior of profile’s circulation and lift enhancement. The results provide a theoretical basis for subsequent experimental study.