The paddy soils derived from red earth are one of the essential paddy soil types in the middle sub-tropical regions of china. From the preliminary study on soil forming process of these soils in Kiangsi province, it was found that they possess not only the characteristics common to the soil forming process of ordinary paddy soils, but also their own specific properties. First, in the condition of double rice cropping system, the accumulation of soil organic matter, both in quantity and quality, represents certain zonality. Second, under the effect of dressing organic fertilizers and liming, it results in rebasification of the soil, and forms a paddy soil having a higher percentage of base saturation. Third, the redox process and leach-illuviated process are stronger, causing the ferric and manganic oxides in soil profile to redistribute obviously. Nevertheless, the paddy soils derived from red earth have also inherited some properties from the soil materials to a certain extent. The silica-alumina ratio and clay mineral types are similar to red soils.