Abstract: In order to find out the paleotemperature evolution of the stratotype section in Duliuzhen group, Dahuangwa group and Xizhaizhuang group, the author study several geochemical indexes. The content researched and the results are as follows. Using R-type convergent analysis to study the change of paleoclimate in the basis of the content of CaCO3, pollen paleotemperature, the ratio of Fe2＋/Fe3＋ and the ratio of Rb/Sr, finding out the correlation coefficient of pollen paleotemperature with the ratio of Rb/Sr is 0.927, and there is a significant negative correlation between the content of CaCO3 and the two indicators, the correlation coefficient is -0.721.Carrying on the scatter plot analysis for the ratio of Fe2＋/Fe3＋ and the ratio of Corg /P2O5 in the basis of analysis for oxidation-reduction environment, and there shows great convergent between the ratio of Fe2＋/Fe3＋and Corg /P2O5. Using R-type convergent analysis to study transformation environment of marine and continent facies in the basis of five group data including the ratio of Sr/Ba、B/Ga、Rb/K、SP、Ca/（Ca+Fe），the correlation coefficient of Sr/Ba and B/Ga is 0.946, which has greater correlation with Ca/(Ca+Fe), the coefficient is 0.894.Using R-type convergent analysis to select the effective indexes of paleoclimatic change, oxidation-reduction environment and transformation environment of marine and continent facies in the basis of the data of CaCO3 content and Corg /P2O5、Ca/(Ca+Fe)、Fe2＋/Fe3+, the correlation coefficient of CaCO3 and Corg /P2O5 is 0.946, and coefficient of Ca/(Ca+Fe) is 0.90.Meanwhile, calculate the data related by optimal segmentation method one by one, and finally find out three sections, including cold climate section of Ⅰto Ⅴ, oxidation-reduction zone of Ⅰto Ⅵ and seawater section of Ⅰto Ⅵ.