Climatic proxy of stable carbon isotope, together with total organic carbon content, in organic matter in lake sediment is one of the most effective methods to reconstruct past climatic evolutionary sequences. By coupling the indexes of TOC and δ¹³C_org in Xingcuo lake sediments and instrumental meteorological data in Zoige Basin, Eastern Tibetan Plateau and by building relative function relations among them, we probed quantitatively modern climatic signals recorded in those indexes. The results showed that there were remarkable relations between contents of TOC and precipitation, δ¹³C_org and air temperature, of which coefficence reaches to-0.67 and -0,75, respectively. Besides, we also demonstrated that average variation between contents of TOC and precipitation (dTC/dP) is -0.046%·mm^-1 and -0.84‰·℃^-1 for δ¹³C_org and air temperature (dδC/dT). According to the above, relative function relations among them were built.