Four typical profiles of albic soils from the maim distribution areas in China were collected to study for mechanical composition,chemical properties and geochemical elemental vanability of albic soils.The main results are summarized as follows:1.The particle size distribution of the non-clay fraction and soil TiO₂ content calculaced on the basis of >0.002 mm soil particles,the SiO₂/A1₂O₃ of soil and A1₂O₃(K₂O-I-MgO) of non-clay fraction proved that each profile has a uniform parent material 2.The mechanical composition of albic soil has a property of "double layers".The argillic horizon contains much more clay than the albic horizon.The ratio of clay in the argillic horizon to that in the albic horizon is >1.2.3.During the soil-forming process,clay moves from the albic horizon to argillic horizon,which,rather than the lithologically uncononuous deposition of parent material,results in the "doublo layersf9"double layers".4.The Properties of geochemical elemental variability are that SiO₂ and MnO were enriched in the albic horizon while FezOs in the argillic horizon;Fe₂O₃,MnO,TiO₂ and Al₂O₃ were enriched in caay,but SiO₂ in the non-clay fraction.