结合前人对三峡和宜昌地区第四纪古气候的研究资料表明，发现三峡、宜昌地区

结合前人对三峡和宜昌地区第四纪古气候的研究资料表明，发现三峡、宜昌地区在第Ⅴ、Ⅳ级阶地形成时古气候以暖湿气候为主，第Ⅲ、Ⅱ、Ⅰ级阶地形成时以干冷气候为主，与宜宾地区的气候转型时间不同。通过对第四纪古气候大背景的分析，并分析青藏高原隆升和西南季风演化过程，发现宜宾地区中更新世古气候特征与大气候背景相一致，后期变干、变冷则与青藏高原隆升引发的环境效应有关。而三峡和宜昌地区与研究区第四纪古气候演化的差异表明，古气候的演变又同时与西南季风的演化过程相关。

结合前人对三峡和宜昌地区第四纪古气候的研究资料表明，发现三峡、宜昌地区在第Ⅴ、Ⅳ级阶地形成时古气候以暖湿气候为主，第Ⅲ、Ⅱ、Ⅰ级阶地形成时以干冷气候为主，与宜宾地区的气候转型时间不同。 通过对第四纪古气候大背景的分析，并分析青藏高原隆升和西南季风演化过程，发现宜宾地区中更新世古气候特征与大气候背景相一致，后期变干、变冷则与青藏高原隆升引发的环境效应有关。 而三峡和宜昌地区与研究区第四纪古气候演化的差异表明，古气候的演变又同时与西南季风的演化过程相关。

Based on the previous research data of Quaternary paleoclimate in the Three Gorges and Yichang area, it is found that the paleoclimate in the Three Gorges and Yichang area is mainly warm and humid when the fifth and fourth terrace is formed, and dry and cold when the third, second and first terrace is formed, which is different from the climate transformation time in Yibin area. Based on the analysis of the Quaternary paleoclimate background and the uplift of the Qinghai Tibet Plateau and the evolution process of the southwest monsoon, it is found that the paleoclimate characteristics of the Middle Pleistocene in Yibin area are consistent with the background of the climate, and the later drying and cooling are related to the environmental effects caused by the uplift of the Qinghai Tibet Plateau. The difference of the Quaternary paleoclimate evolution between the Three Gorges area and Yichang area shows that the evolution of paleoclimate is related to the evolution of the southwest monsoon at the same time.<br>