Guizhou is a mountainous plateau situated in subtropical region.Desilicification and allitic processes are both occurred in soil forming process of the regional soils such as yellowbrown earth,yellow earth,red earth and latosol.The effect of parent material on the soil depends on the types and property of different parent rocks.For regional soils,parent material is the criterion for the classification of soil family level.The formation and property of regosols are affected more greatly by the parent material,while the influence of regionality is only reflected in the classification of suborder level.The influence of vegetation and cultivative activity on the soil genetic property is reflected markedly in fertility of soil and the most remarkable influence of human activity is on the paddy soil.Guizhou is a mountainous plateau situated in subtropical region.Desilicification and allitic processes are both occurred in soil forming process of the regional soils such as yellowbrown earth,yellow earth,red earth and latosol.The effect of parent material on the soil depends on the types and property of different parent rocks.For regional soils,parent material is the criterion for the classification of soil family level.The formation and property of regosols are affected more greatly by the parent material,while the influence of regionality is only reflected in the classification of suborder level.The influence of vegetation and cultivative activity on the soil genetic property is reflected markedly in fertility of soil and the most remarkable influence of human activity is on the paddy soil.