A complex experiment was conducted to determine humus regime, colloid forms and fractional structure of humus in red-brown and brown (natural and park) soils of south mountain coast of Crimea in Ukraine in 2004-2005. Results showed that, general and mobile humus contents were more in the park soils. Humus type in the natural soils was humate and in the park soils was fulvic-humate. Active humus content was higher in the park soils, so humus quality was worse in the park soils than natural soils. Also soil formation process increases the free acid contents in brown soils, so to us it is established that plant species (bamboo, cedar, oak [in park soils] and wild trees [in natural soils] and soil formation process reduce the ratio of CHa : CFa in the red-brown and brown soils. Key words: bamboo, cedar, oak, humus (general, mobile, active, passive), organic carbon, humic and fulvic acid, humate, fulvate.