To investigate the influence of plasma actuation on film cooling efficiency, a numerical study of the distributions of the flow fields and cooling efficiency is employed with different placement of plasma actuation pole in several ratios. And their distributions are compared with the distributions of baseline holes to reveal the good effects of the plasma actuation on the film cooling performance. The results show that the plasma actuation can attract the cooling flow to form better coverage on the hot side, thus improving the film cooling efficiency. The improvement of the film cooling efficiency is significant at lower blowing ratio with shorter distance between the plasma actuation pole and the outlet of film hole.