Abstract: During its interaction with local climate and surface and shallow soil,vegetation appears to be of certain hydro mechanical effects,and provides with some engineering properties on erosion control and slope protection.Slope eco engineering integrates these properties with soil for slope protection projects.Along with the increasing awareness of the interactions between vegetation and soil and their significance in erosion control during the past few decades,this biological approach has been widely applied in physical environment improvement and engineered slope protection world wide.Some important contents in slope eco-engineering are the concept of “soil-vegetation system” and the related biological natures and engineering properties.The“soil-vegetation system”concept is a theoretical substance,and its eco biological natures,engineering properties and some internal regulations are the theoretical hypothesis of the substance,which could be the basic materials for setting up the scientific principles of slope eco engineering.

Key words: Vegetation, Erosion control, Slope eco-engineering