Abstract: The site under study is situated in northeastern Zhengzhou.Many pollen grains of arbor,shrub and herb have been found in sediments.Arboreous pollen grains are mainly of coniferales including the genera Pi-nus and Betula etc.,and sh-rub and herb pollen of Ephedra,Artemisia,Chenopodiaceae and Compositae.On th basis of obtained results it is believed that the Dahocun site was once covered with a forest steppe vegetetion;the climate had a change as the site formed.In the early stage the prevailing climate was warm and humider;in the middle stage,warm and moist;in the late stage,warm and drier.Poynological date and ¹⁴C age indicate local sediments as the Middle Holocene for the lower and middle parts and the Upper Holocene fer the Upper part.