The iron oxide in soils plays a very important role in plant nutrition,soil environmental chemistry and biogeochemistry,and it is very easy to transform corresponded to the changes of environmental factors,especially the soil organic matters.The present paper deals with the iron transformation in rice rhizosphere of paddy soil derived from Quaternary red clay (QP),albic soil (AP),red soil derived from Quaternary red clay (QR) and lateritic red soil (LR) after growing rice (Oryza sativa L.cv.Yanggeng No.2)using a rhizobox.The results showed that the contents of amorphous iron oxide (Fe_o),free iron oxide (Fe_d),complexed iron oxide (Fe_a) and the activity of iron oxide in the rice rhizosphere of the paddy soils as well as the contents of Fec in rice rhizosphere of the two red soils were lower than those in the non-rhizosphere soils.The contents of Fe_o and Fe_d and the activity of iron oxide in rice rhizosphere of the two red soils,however,were higher than those in the non-rhizasphere soils,which demonstrated that iron oxide was activated in rice rhizosphere due to to the activity of rice root and the action of microorganisms on the root surface and in the rhizosphere.