Because the relationship between LAI and NDVI is not unique and vary with structure of vegetation. We adopted NOAA-AVHRR images in the northern great plain to map distribution of the leaf area index（LAI）

average leaf angle（ALA） and so on

instead of using NDVI that is very popularly used in China. This paper first validated NK inversion algorithm using measurements of SE590 spectraradiometer in Yucheng Experimental Station. The optimum conditions for inversion are that view zenith ranged from 40 or so

view azimuth ranged -10 to 10.A comparison between inversion result and NDVI is conducted. There are two advantages to be obvious for using inversion algorithm of N-K model. 1) Ecologic parameters can be inverted directly without using correlation statistic method. 2) More than two parameters such as LAI

ALA

LAD can be obtained for n>2 inversion

whereas NDVI is just itself one parameters. 3) The bidirectional effect can be considered in the inversion algorithm

but NDVI can not. As a result

although improvement is necessary for the inversion algorithm in future

it is worth to test and apply that in wider range. 