The organic materials in lake sediments mainly come from (1)autogenous materials (21)al lochthonous materials. As in the second case.the organic materials in sediments mainly come from the plants which were brought into the lake by flowing water,So the δ¹³℃ vaktes of the or ganic m aterials are controlled by the plants types.The values of δ¹³C of the organic materials l1 sediments can supply the information of w hat types of plants the organic materials come froln. According to the plallt types the paleoclimatic information Can he obtained, Aco rding to the verticaI distribution of the δ¹³C in Dabusu Lake.has been reconstructed the paleoclimate evolution of this region since 1 5000 years as fo[iows： 15400-14000 aB P (depth 8.10-7.30m )： the climate was cold and wet. During this stage there was a high lake level and stable environment. 14000 12200 aB P (depth 7,30-6,30m )：the climate was dry and tem perate. The Lake level descended rapidly, 1 2200-9500 aB P (depth 6,30-4,85m )：The climate was cold and wet, 9500-7800 aB P (depth 4.85～4,00m )：The climate came back to warm and dry.and Ihe lake Ieve1 was Iow. 7800～5500 aB P (depth 4.00-2,80m ) The temperature fell and the lake level rose.The climate was cooI and wet. Since 5500 aB P (depth 2.80-0m )：The climate bacame warm and dry. The Lake water condensed rapidly and finally the lake evolved into a saline hke.