Six main purplish parent materials of soil in Sichuan basin have been studied by chemical,physical,differential thermal,X-ray and micromorphological analysis and pot culture. Results obtained are as follows:1.The difference in SiO₂/RiO₃ ratio of the clay minerals among the soils derived on purple parent material,parent material and rock is insignificant.There are irregular lithorelicts in both soil and its parent material.Microaggregates are poorly developed in the soil.All these indicate the feature of purple soil characterized by the profile of A-C pattern and being young skeleton soil.