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首次提出用石笋中稳定同位素记录重建由降雨量和降水气团同位素组成所反映的古气候历史，从而为研究高分辨率的古季风气候信息开辟了新的途径。利用Ｈｅｎｄｙ准则、洞穴温度、研究区水系的δ１８ＯＨ２Ｏ值以及温度公式，证实了同位素分析结果的可靠性，ＣａＣＯ３－Ｈ２Ｏ之间存在同位素平衡分馏。对采自石花洞的石笋样品进行了分辨率约为２５ａ的δ１８Ｏ和δ１３Ｃ的分析测量，从而得到３０００ａ以来，北京地区古气候和古环境的变化信息
For the first time, it is proposed to use the stable isotope records of stalagmites to reconstruct the paleoclimate history reflected by the rainfall and precipitation isotope composition of the precipitation, which opens up a new way for the study of high-resolution paleoclimate information. The Hendy criterion, cave temperature, δ18OH2O value of water system in the study area and temperature formula were used to confirm the reliability of the isotope analysis results. There is isotopic equilibrium fractionation between CaCO3-H2O. The stalagmite samples collected from Shihhotong Cave were analyzed and measured for δ18O and δ13C with a resolution of about 25a to get the information about paleoclimate and paleoenvironmental changes in Beijing since 3000a