Abstract: This paper analyzed the contents of protein, fat and starch of 30 sample varieties from different parts of the country, which had been grown on 10 ecological plots, and then studied and indicated the differences among varieties and their growing regions, finally investigated roughly the relations among protein, fat and starch content, and their relations to the main ecological factors. The results showed. (1) Ecological environments have very important effects on protein, fat and starch content. Protein and fat inereased as latitude and elevation increased. But starch content showed the opposite result. Higher protein and fat contents and lower starch content were found in varieties which were sensitive to day illumination times; (2) The varieties which were grown in the northern part of North China Plateau, no matter wherever they came from northern part of the plateau or other parts of the country, showed all higher average protein and fat contents because of the special ecological environments there; (3) Protein, fat and starch had very notable relations among them. The possibilities of combining higher protein and higher fat into one genotype exists.

Key words: Millet, Protein, Fat, Starch, Ecological factors