试验采自江西省临川县第四纪红色粘土发育的红壤为样品进行研究表明：红壤及其复合体中Ｏ－Ｐ，Ａｌ－Ｐ，Ｃａ－Ｐ，Ｆｅ－Ｐ的质量分数在同一粒径的复合体随肥力水平提高而增加，同一土壤中不同粒径的复合体４种不同形态无机磷质量分数随粒径增大而减小红壤中不同形态无机磷主要存在于＜２μｍ的复合体中，随着粒径增大，其质量分数迅速减少培肥土壤，可以迅速增加Ａｌ－Ｐ的质量分数，增加作物磷的供应 The results showed that the mass fraction of O-P, Al-P, Ca-P and Fe-P in the red soil and its complex was the same in the red soil of Quaternary red clay in Linchuan County, Jiangxi Province. With the increase of fertility level, the four different forms of inorganic phosphorus with different particle size in the same soil decreased with the increase of particle size. Different forms of inorganic phosphorus in red soil mainly existed in the complex <2μm , With the particle size increases, the mass fraction decreased rapidly  fertilize the soil, you can quickly increase the mass fraction of Al-P, increasing the supply of crop phosphorus 