Closed saline lake is sensitive to the paleoclimatic change. The paleoclimatic change will bring about change of the lake level, saltness of lake water and type of ionic composition, which may be recorded in lake sediments. According to the vertical distribution of δ¹⁸O and carbonate content of Dabusu Lake, the paleoclimatic evolution of this region since 15 000 years has been recorivStructed as follows:15 400-14 000 aB. P. (depth 8.10-7.30m);the climate was cold and wet.resulting in a high lake level and stable environment. 14000-11 600 aB. P. (depth 7.30-6.00m):the climate was dry and temperate heading to rapid decline of water level. 11 600-9 500 aB. P. (depth 6.00-4.85m):the climate was cold and wet. 9 500-7 840 aB. P. (depth 4.85-3.95m):the climate became warm and dry again and the lake level was low. 7 840-6 740 aB. P. (depth 3.95-3.35m);the temperature fell and the lake level rose. The climate was cold and wet. Since 6 740 aB. P. (depth 3.35-Om):the climate became warm and dry. The lake water condensed rapidly and finally a saline lake came into being.