At present,Professor Huang Bingwei, Honorary director of Institute of Geography, CAS,has pointed out that the young earth system science is the basis of strategies for sustainable development.The earth system consists of land, ocean and atmosphere together with the exchange of material and energy across their interfaces.Professor Huang has emphatically pointed out that territorial system is the centre of socio-economic development and the scene of most complicated natural conditions.It lags behind in earth system research.Geographers are urged to make up the deficits.With regard to sustainable development, the time span of researching territorial system is generally kept within 50 years or so, and "meta-synthesis" and combination of "Top down" with "Bottom up" will be used in the research.On the base of studing his series of scientific exposition, the objective and significance of research, the object and character about territorial system science, methodology of research, time span as well as the fondamental constitute have been expounded in this paper.