As an important idea and methodology on modeling of the response of vegetation to climate change, predictive vegetation mapping (PVM) has been attracted for the studies on the impacts of global climate change by many foreign ecologists and geographers. This paper introduces briefly the processes of PVM studies, summarizes the methodology of PVM, and then discusses the role of PVM to model the response of vegetation to climate change. Especially, in this paper, the role of geo information system (GIS) to model the response of vegetation to climate change is emphasized, and the methodology and process of vegetation climate modeling by GIS are induced.