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根据黄土高原３个剖面的孢粉资料及测年数据，恢复了本区１８０－７３万年期间的植被面貌。在此基础上，结合中国和全球其它地区的孢粉、构造、地层、水系演化和火山活动等特征。将此期间植被、气候和环境的演化划分为３个主旋回，６个主要演化阶段，１０个亚阶段和５个事件。初步认识到，该时间段的气候环境演化有较大波动，且这些变化不限于局部地区，而是区域性的，是多种因素（内外动力）作用的结果，且有规律可循。
According to the sporopollen data and dating data of 3 sections in the Loess Plateau, the vegetation appearance in 180-73 000 years of this area was restored. On this basis, we combine the features of sporopollen, tectonics, stratigraphy, water system evolution and volcanic activity in China and other parts of the world. The evolution of vegetation, climate and environment during this period is divided into three main cycles, six major evolution stages, ten sub-stages and five events. It is preliminarily realized that there is great fluctuation in the climate and environment evolution during this period, and these changes are not limited to local areas but regional ones. They are the result of a variety of factors (internal and external motivation) and are regularly followed.