Ecological security is the key part and base for agricultural sustainable development.A review of ecological security was given from the aspects of concepts

features

and meanings

status and methods

as well as themes of studies on ecological security at home and abroad.By taking a county as a basic unit

an integrated evaluation of agricultural ecological security in Hunan Province was made in terms of the pressure

quality

rehabilitation ability of resource-ecology-environment

using the technique of AHP.The result indicates that regional heterogeneity of security degree is distinct

which not only decreases from east to west

but also decreases from south to north

with the exception in a few areas.The quality of resource-ecology-environment is the base of spatial patterns for a- gricultural eco-security in Hu' nan Province.However

the pressure and rehabilitation ability of resource-ecology-environment also have a great impact on ecological security and influence its spatial pattern.The strategy for establishing ecological safety of agricultural sustainable development is pointed out as well.