基于对豫西皖北地区和华北、华南二叠纪植物化石分布状况的全面对比统计，简略分析了豫西皖北地区二叠纪植物群演替，将该区各阶期与华北及华南同期植物群进行了比较，并对其间Ｓｉｍｐｓｏｎ相似性系数作了求算。结果表明它应作为华夏植物群华北植物区内的一个次级植物地理单元对待。其成因与华北、华南二叠纪时古板块的旋转、漂移、聚散等行为及其特定的古地理条件密切相关 Based on the comprehensive comparative statistics of the Permian plant fossils in the western Henan and northern Anhui and the North China and South China, the succession of Permian flora in the western Henan-northern Anhui area is briefly analyzed. The same period in South China flora were compared, and during Simpson similarity coefficient was calculated. The results showed that it should be treated as a secondary plant geographic unit within the Huabei flora of North China. The causes are closely related to the behavior of the Permian ancient plates in North China and South China, such as rotation, drift and polygamy, and their specific paleogeographic conditions