Abstract: Palynology and sedimentology research on Zhangjiawan site in Daning valley, the Three Gorges of Changjiang River during East Zhou to Han Dynasties show the relation between environment evolution and human activity in this region over 3000 years. There was warm-humid climate when man dwelled on this place at first. During East Zhou to Han Dynasties there were warm-cold and a little arid climate. After this stage,a transient large-scale deluge took place in this area. After that,human activity became more active, natural plants were destroyed severely, water and soil lost largely, and mountain torrent became frequent which resulted in that there weren't continuous cultural fault after Han dynasty. But a lot of debris talus materials were accumulated resulting from mountain torrent.