Through field survey,lab analysis and reference to large volumes of soil profile data,study on basic soil taxonomy of Earth-cumulic Orthic Anthrosols(Lou soil) was carried out in Guanzhong,Shaanxi Province.Soil classification was made at the soil family level based on particle composition,soil mineral composition and soil temperature.Of the profiles with the control sections(0 to 160 cm) of soil <2 mm,the majority were of clay loam,and the minority of loams or sandy loam in texture.The soils were dominated with illite,mixed illite or vermiculite in mineral composition and mesic or low-thermic in soil temperature.The control section of the soil series was defined to be from the top of surface horizon down to 160 cm in depth or to the bottom of the diagnostic horizon when the bottom of the diagnostic horizon exceeds 160 cm in depth.The diagnostic horizon had 11 characteristic horizons,i.e.Fimic epipedon,Earth-cumulic epipedon,Mollic epipedon,Agric horizon,Argic horizon,Weak-argic horizon,Intensive-calcic horizon,Medium-calcic horizon,Weak-calcic horizon,Redoxic horizon and Weak-cambic horizon.Based on the data of the 9 profiles and other related data of Earth-cumulic Orthic Anthrosols(Lou soil),the soils could be sorted into 9 soil families and 9 soil series.Typical characteristics of the soil series and differences between the series were described.