Taking Zhifanggou watershed for an example

t his paper aims to design an evaluation index system for agricult ural ecology securit y in the loess hill and gully region.The developing course of eco-economic sys- tem is divided into 4 stages according to the conditions of agricult ural ecology securit y in nearly 70 years.Then the authors discuss the main factors which affect agricult ural ecology securit y and obtain a series of e- valuation indexes by analyzing the 4 stages.The evaluation indexes are selected

classified

and confirmed based on the index selecting principles of scientific foundation

developing condition

practicalit y

and so on

and by ref erring to the model of “ pressure state response”(PSR) and the suggestions from several experts.The evaluation index system of agricult ural ecology security suitable for the region is established

in- eluding ecological environment

social-economy

and integrative function

as well as 20 specific indexes.