The model of ecological footprint( EF) was originally brought forward by ecological economist William E. Rees and his fellows in 1992,and Wackernage modified and perfected the model in 1996. Ecological footprint is an effective method to evaluate the ecological security and sustainability of a region from the aspects of demand and supply. Ecological footprint is defined as biologically productive areas required to sustainably support certain population in a region,and ecological footprint theory can be simp...