Investigation on the soil humus under different forest types indicated that: (1) In those years both litter and C/N ratio of surface soil were the highest in the pines tabulaeformis forest lands, but the lowest' in the Hippophae rhamnoides lands. The C/N ratio of surface soil was positively correlated with the age of forest and the C/N ratio of litter, but negalively correlated with the ash content of litter. (2) The average contents of humic acid, humin, fulvic acid in the soil profiles decreased in the following sequence: Betula platyphallo forest land>Quercu Liaotungensis land>Quercu Liaotungensis+Popular davidiana forest land>Populus davidiana forest land>Hippophae rhamnoides forest land>Pines tabulae-formis forest land, i.e. broad-leaved arbon forest land>shrub forest land>coniferous forest land; but the average content of humin was in an opposite order. (3) The aromaticity of surface soil of the Ziwu Mountains declined in the following order: Betula platy phalla forest land>Quercur Liaoturtgensis forest land>Quercu Liaotungensis+Populus daviana forest land>populus daviana forest land>Pines tabulaeformis forest land>Hippophae rhamrtoides forest land; whereas that of the Liupan Mountain was in the order of Populus davidiatta forest land>Quercus Liaotungensis forest land. The profile humic acid aromaticity of the Ziwu Mountains and the Liupan Mountain decreased in the following sequence: three layer>two layer>one layer.