Kinetics characteristics of phosphate adsorption-desorption by Loessial soils were studied under the conditions of continuous liquid current. Phosphate was adsorbed and desorbed at different rates. According to the rate, the reaction of adsorbing-desorbing could be divided into three types: fast, middle and slow reactions. Elovich equation was the best model to decribe the adsorption and desorption of phosphate, while the first-order and parabolic diffusion equations were the worst; but the worst models were "sensitive" to the changes of reaction rate and could be used to classify reaction type and to study the reaction meachanism. The rates of adsorption and desorption were closely related to the soil clay and CEC. The influences of free Fe₂O₃ on adsorbing rate and CaCO₃ on adsorbing rate under lower temperature and desorbing rate under higher temperature were siginficant. The rapiddly available phosphorus was an important factor to control the desorption rate. The rate of phosphate adsorption was significantly influenced by temperature, but the effect of temperature on the desorption rate was not significant. The adsorption and desorption rates, capacit, of phosphate and reaction time varied with soil types and horizons.