The present study was carried out on paddy osils under conditions of coutinuous application of organic manures.We found that organic manuer applied could provide nutrients deficient in rhizospherea enchanced the formation of chelated compounds of Fc and Mn in root horizon and play a significan role in decreasing the lignifcation of mechanical tissue and in increasing the stelar cathether diameter of roots.Therefore,it could faver the absorption of water part and the coordiation of the growth of plant and mictrobes.Therefore the application of organic manure proved to be of great significance for improning the root horizon environment and enhancing the root system function in paddy soils.