Ecological degradation research is one of the focused problems of today's ecology.A review of ecological degradation study and analysis on the concepts of degradation including soil degradation,land degradation,desertification and eco-degradation are given.The eco-degradation is divided into three levels:(1)single ecological factor;(2)natural ecosystem;(3) social-economic natural complex ecosystem (SENCE ).Finally,the study scope of eco-degradation is presented,which-includes:(1)theory and methodology of ecological of degradation;(2) mechanism and process of eco-degradation;(3)quantitative evaluation of eco-degradation;(4)prediction and systematic monitor of eco-degradation;(5)restorationand reconstruction of eco-degradation.