The field spectra reflectance data selected at key growth stages of winter wheat were analyzed. It indicated that the wavelength bands related to leaf nitrogen content selected by regression equation located at 820-1100nm and 1150-1300nm. The proper spectrum reflectance form should be established for donating the spectrum reflectance and leaf nitrogen content at different growth stages. The proper forms were as following: the regression equation of derivative form at reviving stage

and the reciprocal form at booting stage and the basic form at ripening stage. The results showed that there were robust correlations between leaf nitrogen content and other leaf biochemical constituents

dried biomass indicators and grain quality indicators. The regression equations between leaf nitrogen content and other leaf biochemical constituents

dried biomass indicators and grain quality indicators were established. The predictions of soluble sugar content

leaf water content

stem water content

leaf starch content

leaf dried weight

plant dried weight

and LAI etc. by leaf nitrogen content were feasible. It has very significant level among grain protein

dry gluten content and leaf nitrogen content at anthesis stage

and no significant correlation of leaf nitrogen content and other grain quality indicators. So it is feasible for forecasting the grain protein and dry gluten content by leaf nitrogen content data acquired by remote sensing.