The influences of rice-planting duration on iron and manganese oxides were studied by using paddy soils and dry lands in Zhejiang of different planting chronosequence. The results revealed the migration regularities of iron and manganese oxides in soil profiles and the diagnostic significance during the formation of paddy soil. The variations of total iron, free iron oxide and total manganese increased with the increase of rice-planting duration. Total iron, total manganese and free iron oxide accumulated at the low layers after a certain years of rice planting. Among the iron and manganese oxides, free oxide and total iron were the most significantly diagnostic factors for the classification of paddy soil. Amorphous, complex iron and complex manganese were significantly positively correlated with organic matter content, thus, the influences of rice-planting duration on amorphous iron and complex iron could be considered to recur to the role of organic materials.