The film cooling is widely used in the thermal protection of aircraft engine. To improve the effectiveness of film cooling, three kinds of tabs are designed, and experimenal results of film cooling effectiveness show that tabs on the film holes can effectively strengthen the film cooling efficiency, which makes the film cooling effectiveness much higher than that without tabs. The effects of blowing ratios on film cooling is different for different tabs, and there exists an optimal blowing ratio which is different for different tabs. The blockage ratio of tabs has a great influence on film cooling effectiveness. The three kinds of tabs keep the same film cooling characteristics that the film cooling effectiveness increases with the increase of the blockage ratio.Trapezoidal triangle tab is obviously better than the other two kinds of tabs. However, the discharge coefficient of the film hole is largely decreased by the tab.