The paper analyzes the environmental change in Bosten Lake since 1958 and points out the reasons in the context of both natural environment and human activities. In the last 40 years, the impacts of the natural factors on water level change is more than the contribution of human activities in the water level change; however, the water quality change is mainly influenced by human activities. The fact that Bosten Lake has become a salt water lake rapidly from a fresh water one is related to special geographic...