Environmental proxies of temperature, humidity and age determination are crucial in the paleoenvironment reconstruction research. In the lacustrine studies, many indexes can indicate the humidity change, but the effective quantitative temperature proxy is still lacking. Microbes in soil and lake sediment can synthesize certain compounds such as bacterial membrane lipids—branched glycerol dialkyl glycerol tetraethers (bGDGTs) in the process of their growth, which can form particular isomers under different temperatures and can be preserved for a long time, so can sensitively record the temperature at their preservation. However, the influence of autochthonous vs. allochthonous, variety of environmental factors and diagenetic process make it uncertain for the construction of MBT/CBT proxy by using this kind of compounds, and the quantitative conversion function with temperature has not been established. This project will be carried out for the modern process research in Lake Bosten, Xinjiang. Sediments in different location of the lake and catchment soils around the lake will be collected and explored. Through the analysis of the bGDGTs compounds in the samples, the source of bGDGTs compounds can be identified, the influence of environmental factors to the bGDGTs compounds will be investigated， the preservation and degradation mechanism of bGDGTs compounds will be found out. At last, the quantitative temperature transfer function will be constructed.