In the application of remote sensing,the vegetation index has been widely used to token the coverage and growth of the vegetation qualitatively and quantitatively.Due to the influence of atmospheric variation,the vegetation index cannot reflect the realistic distribution of the vegetation on the earth’s surface.A simple method is proposed to eliminate the influence of the atmosphere on Normalized Differece Vegetation Index(NDVI) and reduce the impact of atmosphere on the vegetation index by calculating the path radiation received by the satellite sensor according to the water body of the third and fourth band in the China Brazil Environment Resoure Satellite(CBERS).Results suggest that the vegetion index can reflect the growth and distribution of the vegetation much better by using the method discussed.