通过近一个世纪的探索研究，我国晚古生代植物化石组合序列已经基本得到确立。二叠纪达到鼎盛时期的华夏植物群已经举世闻名。然而，我国二叠纪末期的植物组合面貌至今仍然扑溯迷离，甚至在很多区域，长兴期植物地理区系性质究竟是否属于华夏植物群，尚有争议。尤其是我国北方的晚二叠世长兴期植物化石面貌，已有的认识还十分差强人意。其根本缘由，主要是我国北方二叠纪长兴期为大套的红色岩层，鲜有保存理想的植物化石层位发现。有鉴于此，申请者立足于多年来积累和发现的长兴期植物化石产地层位及其相关的线索，重点开展对我国北方的长兴期植物群的专题研究。力争全面揭示其植物群的整体面貌，探明其植物地理区系性质。在完善我国晚古生代植物化石组合序列的同时，揭示二叠纪末生物大灭绝前夕陆地植被的响应状况。

After about a century investigation, the Late Palaeozoic plant fossil assemblage sequences in China have been substantially established. The Cathaysian Flora that flourished in Permian has been well known worldwide. However, the end Permian floras in China are still insufficiently understood. For instance, it is still debatable whether the end Pemrian (changhsingian) flora is phytogeographically Cathaysian. Especially in northern China, the Changhsingian flora has been rather poorly known. This is mainly due to the difficault to find well preserved plant-bearing beds in the red deposits all over northern China. Therefore, the allpicant proposes to detect the Changhsingian floras in northern China, based on previously found plant fossil localities, which we recongnized when we were conducting other field research. We shall try to describe the whole Changhsingian flora, and analysize the phytogeographical feature. As a result, we shall contribute to a better Late Palaeozoic plant fossil sequence, and to promote our understanding on the vegetational response to the end Permian mass extinction event.