Aimed at the problem of drag reduction on the surface of van body,the method of air film drag reduction was proposed to reduce the wind resistance of van body.The air film generator and the wind resistance test device were designed,the wind resistance tests were performed for the vans with and without the air film generator respectively in the wind resistance test device.The test result shows that the air film generator has a good effect of drag reduction,and it verifies that the air film drag reduction method can be used to reduce the wind resistance of van body.