Through the analysis and contrast between HM core and Dh core, combined with the data of AMS14C, six pollen assemblages were ploted out. At the mean time, six stages about the vegetation change and climate fluctuation were rebuild. In addition, there were three subassemblages ploted out in the Atlantic period, SubBoreal period and SubAtlantic period, which reflected the less vibration of the largescale climatic change. Pollen assemblage dominated by Concentricystes in the hard and green clay of late Pleistocene can make it sure that the hard green clay layer was formed by water.