Abstract: Phosphorus (p) adsorption characteristics of 5 soil samples were studied in soils of Omidie, Southeastern Iran during 2009/2010 cropping season. The concentrations of the solutions were 4, 12, 25, 50, 70 mg P L-1. Some soil properties as well as selected P-adoption characteristics were studied in these soils. Results show for this study Langmuir adsorption isotherm has better match with phosphorus adsorbed data and has maximum R-square. Differences in P- adsorption was greatly influenced by Soil Organic Carbon (SOC), soil pH, exchangeable calcium, exchangeable aluminium. Regression analysis shows that SOC and Alsat were the highest predictors of P-adsorption in soils of the study site. There is need for inclusion of more soil chemical, physical and mineralogical properties in predicting soil P-adsorption to enhance reliability of information.