Abstract: All the information from the lake environment changes could be well archived in th lacustrine sediments. The changes in lake environment on the different time-scale are resulted from the tectonic movement, climatic change and human impact respectively and meanwhilely. The major tectonic movement in China is the uplifting of Tibetan Plateau, and the climate system is the east Asian monsoon, however, the human impact seems to be more implicated, e.g. the indirect impact such as the vegetation and land use changes in the catchment, or the direct impact such as the lake reclamation and the lake enclosure from large river system. Delineating the mechanism of the lake environment changes and distinguishing the human impact from the natural influence are presently highlighted by the paleolimnologists.