Abstract: The study based on ground parallel observation data showed that since 1981, the whole growth and over-wintering periods of winter wheat in the Loess Plateau of east Gansu Province shortened, the dates of its turning green and harvesting went ahead, but the days from its over-wintering to turning green didn’t have distinct change. Climate warming made the dates of turning green, jointing, flowering and maturing gone ahead, the days from flowering to milkmaturing prolonged, and the days from milk-maturing to maturing shortened. Seed grain weight increased with increasing accumulated temperature ≥10 ℃, but decreased with the raise of maximum temperature in the period from March to harvest time. The yield increased with the raise of average minimum temperature and the increasing accumulated temperature ≥0 ℃, ≥5 ℃, ≥10 ℃ and ≥15 ℃, but decreased with the increase of accumulated temperature ≥20 ℃, which indicated that the increase of high temperature weather had a definite negative effect on the winter wheat yield.

Key words: Geographic Information System(GIS), Agro-ecology information system, Red soil watershed, Land evaluation