来源于十字花科植物菘蓝 Isatis indigoticaFort.的大青叶,是常用中药材,在我国广为栽培。研究发现不同栽培居群大青叶药材的质量有明显差别,由于同种植物药材的形态性状区别不明显,内部组织构造特征也非常相似,加之在采收加工后,药材均呈皱缩卷曲状,有的还破碎不完整,依据药材的性状特征及显微特征对不同居群大青叶药材均难以鉴别。本文采用差热 The Daqingye originated from the cruciferous plant Isatis indigotica Fort. is a commonly used Chinese herbal medicine and is widely cultivated in China. The study found that the quality of different cultivated populations of Daqingye had obvious differences. Because the differences in the morphological characteristics of the same species of plant herbs were not obvious, the internal structure and structure characteristics were very similar, and after harvesting and processing, the medicinal materials were crimped and curled. Some of them are also broken and incomplete. According to the characteristics and microscopic characteristics of medicinal materials, it is difficult to identify different populations of Folium. This article uses differential heat