Leaf area index（LAI） is the fundamental index to indicate vegetation growth and it can be effectively used in agricultural yield estimation.In this paper

we investigate the LAI inversion uncertainty from mixed pixels.There are two situations for the mixed pixels: one is the pixel mixed with crop of different growth stages;the other is the pixel mixed with different components.The result shows that the accuracy of LAI inversion is almost not affected by different corn growth condition.On the other hand

the impact of mixed pixel on the LAI validation is clear.Field LAI measurements of some points don’t stand for the pixel LAI when the pixel consists of crops of different growth.In this situation

we should be cautious for validation of inverted LAI.