本文根据腐化植物体、黄土、古土壤等样品的Ｘ射线衍射和化学分析等资料，初步认识到植物腐化能够形成多种粘土矿物，腐化过程越长，形成的粘土矿物越多；生物成因的粘土矿物主要以粘粒胶膜的形式存在，在镜下表现的是光性定向粘土；黄土中古土壤粘粒胶膜与生物胶膜类似，应属同一成因；生物粘粒胶膜形成在一定的植被和气候条件下，它可以作为重建古环境的追踪线索。 Based on the X-ray diffraction and chemical analysis data of the samples of loamy plants, loess and paleosol, it was initially recognized that the formation of many clay minerals by plant decay could be formed. The longer the decay process is, the more clay minerals are formed. Clay minerals are mainly in the form of clay films, which are light-oriented clay under the microscope. The clay-like clay film in the loess is similar to the biological film, which belongs to the same genesis. The clay film forms in a certain degree Vegetation and climatic conditions, it can be used as a trail to restore ancient environment.