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研究我国北部季风气候区石笋的微生长层及其气候意义，在北京石花洞石笋中发现微生长层。通过年代测定、气候事件控制分析，初步提出了石笋微层的年层时标含义及层厚变化主要响应降水变化的气候意义。试图利用微层的层厚－降水响应关系，重建北京地区最近1130年来干湿变化的年分辨率趋势，通过功率谱分析发现136年、50年、16～18年、11年、5．8年的降水周期变化。
To study the micro-growth of stalagmites in the monsoon climate zone of northern China and its climatic significance, micro-growth was found in the stalagmite of Shichundong in Beijing. According to the dating and climatic event control analysis, the authors first proposed the climatic significance of the stratospheric meaning and layer thickness of stalagmite micro-layer in response to the change of precipitation. Trying to reconstruct the annual resolution trend of the wet and dry changes in Beijing in the recent 1130 years by using the relationship between the layer thickness and the precipitation of the micro-layer, and finding the annual resolution of 136 years, 50 years, 16-18 years, 11 years and 5.8 years according to the power spectrum analysis The precipitation cycle changes.