Abstract: Prehistoric cataclysms and their impacts on human paleo-culture have been a focus of the scientists in the world. Some ancient trees relatively undamaged back, roots and branches were unearthed from paleochannel in the Peking University campus. The burying position, the characteristics and the age of the trees indicate that the flowage of ancient Yongding River resulted in the event at about 5000a B P. The trees, together with the Neolithic culture relic unearthed at the same time, show that the disastrous floods definitely occurred at about 5000a B P in Peking area.

Key words: Peking University campus, buried ancient tree, cataclysm, 5000a B P, Neolithic culture relic

摘要： 史前时期的大洪水及其对人类古代文明的影响一直是中外学者共同关心的问题。北京大学校园内出土的埋藏古树，其埋藏特征和测年数据表明它们是5000a B P前后古永定河洪水泛滥的产物，与古树同时出土的新石器时期文化遗物，提供了洪水给古代人类带来重大灾难的信息。

关键词: 北京大学校园, 埋藏古树, 洪水泛滥事件, 5000aBP, 新石器时期文化遗物