本文认为黄土是个形成土壤的母质.黄土区土壤形成过程的特殊性在于成土作用为黄土的形成作用,成壤作用为植物出现后形成土壤的作用,两种过程在时空上有别.由此提出黄土土壤已具备一个独立土纲的条件,以下可分黑垆土亚纲、塿土化亚纲和新成黄土亚纲,秦岭以南的黄土为变性黄土正纲. Loess is considered to be the parent material of soil formation.The particularity of soil formation process in loess area is that the formation of loess is the formation of soil and the formation of soil after the emergence of plantation.The two processes are different in time and space It is proposed that the loess soil has the condition of an independent soil class. The following subdivisions can be divided into the subfamilies of the subfamilies Hemiptera, the sub-subcultures of the soil and the subcultures of the new loess, and the loess south of the Qinling Mountains is the transformative loess.