Data from 37 counties have been used in this paper and the principal component analysis" adopted for the gradient analysis of Guangdong agro-ecosystem.The result shows, under the comprehensive impact of social, economic and natural resources factors, there is a resources and environment gradient which has a centre at Pearl River delta and gradually disperses towards the surrounding area.According to the location of each county in the gradient, they have been divided into 6 classes: 1 .Suburban agriculture52...