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.