Abstract: The influence of contents in "Qinyou 2" rape under application of different rates of N,P and Kfertilizers on pterygote rate of Lipahis erysimi is studied, and eight mathematical models are established. The results show that soluble carbohydrates, total nitrogen, carbohydrate/ protein and serine affect significantly the pterygote rate of Lipahis erysimi. Secondly, some main factors affecting its pterygote rate are aspartate, threonine, glutamate, glycine, alanine, methionine, isoleucine. leucine, tyrosine, water content, water soluble protein, amide nitrogen and phosphorus content.

Key words: Fertilizer ratio, "Qinyou2", rape, Amino acid composition, Pterygote rate of Lipahis erysimi, spectral recognition mode., remote sensing, black and odorous, urban water body