Abstract: Ecotone is a special zone in the landscape, which is very susceptive to the changes in environmental conditions, and hence, is prone to the disturbance by unfavorable conditions.Human activity has a series of positive and negative effects on it, and greatly changes the geo-chemical process in the ecosystem.In the ecosystem, especially in the ecotone, different systems and regimes are interconnected and inter-determined.For the sustainable development of ecosystem and the protection and rational utilization of resources, it is of great importance to study this internal relationship and to seek rational regulation and control measures.With the ecotone in the west Songnen Plain as an example, and based on the studies of the topography, physiognomy, soil, vegetation, and their geographic distribution in the ecotone.,this paper explained the structure of the ecological landscape, and quantitatively analyzed the ecological geo-chemical processes under different landscape conditions.In addition, this paper also tried to make coupling analyses to the ecologic succession and the landscape geo-chemical environment.Under current conditions, the succession of plant communities and the shift of soil landscape geo-chemical conditions in the west Songnen Plain are almost coinstantaneous, and these two factors can inter-determined under certain conditions.