Abstract: The hole RM, the deepest one fully obtained from the core in the Tibetan Plateau, is situated in the depocenter of the Zoie Basin(33°57′N; 102°21′E)in northeastern Tibetan Plateau with a depth of 310.46 m. From 14 C dating and paleomagnetic stratigraphic study, the core RM dated back to 900 ka B.P.. In this paper we analyzed the compositions of ¹⁸O and ¹³C in various carbonates(snail, obstrode, chemical carbonate)in core RM and discussed preferably the paleoclimatic record by the proxies of δ ¹⁸O and δ ¹³C of chemical carbonate(authicarbonate)from core RM in the past 140 ka.. The results show that the values of δ ¹⁸O in various carbonates are generally identical, and the values of δ ¹³C in it are inconsistent while there exists a better relativity. The studies also demonstrate that there is a negative correlation between δ ¹⁸O and δ ¹³C of authicarbonate in core RM in the past 140 ka, showing that the changes of δ ¹⁸O values is mainly relative to the water temperature. According to the above, the climatic evolutionary sequence in the past 140 ka in the region is rebuilt.