This paper deals with the influence of application of rice straw,milk vetch,weathered coal and polyvinyl alcohol on the properties of organo-mineral complexes of yellow-brown earth (collected from Jiangning) and red earth (collected from Jinxian,Jiangxi).The results obtained are summarized as follows:In the yellow-brown earth,the polyvinyl alcohol and the nce straw were conduave to the formation of aggregates and thus increased the percentage of effective pore spaces of 0.1-0.01 mm.The polyvinyl alcohol treatment could promote the stability of aggregates.In the red earth,the rice straw and the milk vetch might cause dispersion of the aggregates.In above two soils,the treatment of ammonical weathered coal caused highly dispersion of aggregates.