Eight one Soil samples taken from the Hangzhou-Jiaxing-Huzhou plain were studied by the determination of the spore-pollen and micropaleontological fossils.Among those soil,41 samples had spore-pollen combination,and 13 samples had foraminifera.Based on spore-pollen combinations and foraminifera,four rinds of parent materials cauld be classified,including estuarine deposits,lagoon deposits.limnic deposits and plain-river deposits.The palaeogeographical environmental evolution of the plains from mid-Holocene epoch was also discussed.