This paper deals with the effect of application of organic materials on the properties of humic substances in organo-mineral complexes (organic matter in heavy fraction) of silt loamy chernozem and clay loamy light saline meadow soil with Field,pot and culture experiment for two years.The results obtained are summarized as follows:When organic materials applied to the soils the contents of organic matter in soils and in complexes were markly increased.The effects of various organic materials were in the following sequence:peat> distiller's grains> sawdust>corn stalk> soybean stalk > horse excrement>sugarbeet residues.