Some isothermal phosphate sorption curves were determined on typical soils in Zhejiang province of China. Most of the soil samples are paddy soils derived from different parent materials, The isothermal phosphate sorption data obtained all fitted very aveli with Freundlich, Temkiza, Langmuir's conventional as well as its two-site-adsorption equations, and the conventional Langmuir equatzon seemed to be the best fitted model. The parameters in the canventional Langmuir equation, namely the adsorption maximum (q_m) and the constant(k)related to the bonding energy as well as their product,k×q_m can be used as a comprehensive index to characterize the potential posphate sorptivity of the soil. In the present study the k×q_m values of the soil samples tested were found to be 2100 for gaethite, 425-990 for paddy soils developed on red earth, and 4219 for upland red earth. With regard to the textural variation of the paddy soils k×q_m value for sandy loam was 297, for silt loam, 658 and clayey soil with stagnanting water regime, up to 800.