本文通过对桂林水南洞 1号石笋进行α能谱铀系测年及碳氧同位素分析 ,获得了距今 2 0～ 8万年的古气候信息。石笋大于 2 0万年前开始生长 ,8.0 7万年后停止生长 ,属中更新世的产物。其年龄与δ1 8O的变化可与深海岩芯V2 8-2 3 8同位素记录所揭示的第五和第六阶段进行对比。它反映此阶段区内经历了寒冷 (间夹短暂的小温期 )和温暖 (间夹短暂的小冷期 )等气候变化 ,与全球古气候变化波动基本一致 ,同时也存在地区性的气候变化 In this paper, the paleo-climatic information of 20 ~ 80,000 years ago was obtained by dating a stratospheric uranium series and stoichiometry of carbon and oxygen in Stalagmite, No. 1 Shui Nandong, Guilin. Stalagmites began to grow more than 20000 years ago and stopped growing after 8.0700 years, belonging to the mid-Pleistocene product. The variation of age and δ 180 can be compared with the fifth and sixth stages as revealed by the deep sea core V2 8-2 3 ​​8 isotope records. It reflects the fact that the climate changes experienced in the cold region (short-term warm period) and warm (short-lived cold period) are basically the same with the global fluctuation of paleoclimatic changes in this stage, and there are also regional climate changes