Studies on the reaction between phosphate and a calcareous soil in terms of sorption isotherms indicated that at low phosphat concentrations, phosphat was adso rbed on the surface of soil particles; the exchangeability of sorbed phosphate increased with amount of phosphate sorbed suggested that iron and aluminium oxides had an important role in phosphate adsorption in the soil. At high phosphate concentrations, precipitation occured due to formation of calcium phosphate, and the exchangeability of sorbed phosphate declined with the time of reaction and the amount of phosphate sorbed. Kinetic changes of soluble-P, ³²P exchangeable-P and Olsen-P in the soil with and without phosphate addition were also studied through a long period of incubation (up to 260 days) experiment, fractionation of phosphorus in the ³²P labeled soil was conducted finally.