The fragile eco-environment is a special type of ecosystem, its response to the change of environmental conditions is very susceptive. So it is rather prone to be disturbed under unfavorable conditions. Human activity has greatly changed the geo-chemical process in the ecosystem, thus caused a series of positive and negative effects. In the ecosystem, especially in the fragile eco-environment, different systems and regimes are interconnected and interdetermined.For the suntainable development of ecosystem and the protection and rational utilization of resources, it is of great importance to study these internal relationships and seek rational regulation and control measure. This paper takes the fragile eco-environment in the west of the Songnen Plain as an example. Based on the study of the topograph, physiognomy,soil, vegetation and their geographic distribution in the landscape, the paper explains thestructure of the ecologic landscape and quantifies the ecologic geo-chemical processes under different landscape conditions. In addition, the paper also tries making coupling analyses of the ecologic succession and the landscape geochemical environment. And in the paper, some research results are given.