Abstract: In this paper, the geochemical indicators of 27-cm shallow core samples collected from the Huangshui area in the Bosten Lake Basin were analyzed, their values were compared with the meteorological data observed by Yanqi Meteorological Station, and the environmental significance of modern sedimentation was discussed. The results show that climate change at that time (from 90 years ago to around 1980) was recorded well by the core samples at depth of 26-11 cm, that is, a dry climate change and an evaporation increase occurred at first, and then it became warmer with precipitation increase. The dominant factors of isotopic composition of organic matter and carbonate were changed due to the disturbance of human activities, input of external material sources and the eutrophication caused by industrial and agricultural sewage drainage in recent 40 years, thus the function of sediments in recording climate change was disrupted.

Key words: lacustrine sediment, isotopic, climate change, human activity, Bosten Lake