The soil of sandy terraces with pine forests at the eastern part of the Selenga delta river of the Baikal region and their transformation influenced by fire have been investigated. It is shown that the development of processes of the litter formation and slight accumulation of humus and podzolization leads to the formation of Aridic Arenosols. Soil formation influenced by the ground fires takes the direction towards the formation of soil Al-Fe-humus Department - Enty-hipoumbric Podsols. Crown fires lead to the initial stage of the soil formation on the pyrogenic altered sand. Primitive Arenosols covered by acid surface crust with high humus content are formed as the result.