Phosphorus (P) is the limiting factor for agricultural production in red soil regions,so the study about P forms and transports can be meaningful to agricultural production in red soil regions.The forms and contents of phosphorus by upland red soils different in fertilization were studied with the P fractionation method proposed by Hedley.The results show: 1) All the inorganic P and most of the organic P are always lower in soil not fertilized with inorganic or organic phosphorus than in soil fertilized with phosphorus.2) Resin-P and NaHCO₃-P that can be utilized by plant easily are tiny,but P combined with ferric and aluminium and Residual-P are the greatest parts in upland red soil.So the P availability in red soil is low.3) NaHCO₃-P_i,P_i combined with ferric and aluminium,P_o existed in soil aggregates are the most contributive forms to available P(Bray=P).In a word,these results guide us to research on P availability and transformation of phosphorus by upland red soils different in fertilization.And then,they can be theoretical and practical guidance for phosphorus managment in upland red soil.