A long-term field experiment was conducted at the Ecological Experimental Station of Red soil, Chinese Academy of Sciences in order to investigate rehabilitation of fertility in infertile red soils with application of fertilizers. The results showed changes in soil physical properties. The content of macroaggregates in the infertile red soils in the treatment of organic manure application was 100~150g/kg higher than that in the treatment of inorganic fertilizer application.Under upland conditions, in the infertile red soils that had been fertilized with organic manure for 6 years,the macroaggregate content reached 500~600g/kg, close to the level of the red soil in a high-yield citrus orchard. However, six-year application of inorganic fertilizers left the red soil 400~450g/kg of macroaggregates, which was lower than that in the red soil of CK. After cultivation for 6 years with organic manure.bulk density of the infertile red soils decreased to O.9~1.1mg/m³. The application of organic manure also increased total soil porosity by l%~8%,ratio of soil conducting pore space by 3%~20%.ratio of >200pm pore space to 9.6%~18.9% with an average of 14.6%,and field moisture capacity by 0.7%~4.5%.Therefore,application of organic manure was an important and effective measure for rehabilitation and maintenance of physical fertility of red soil