This paper studied the adsorption behavior of trivalent chromium to dark brown forest soil and its composing component by means of flame atomic absorption spectrophotometer.The result showed that the absorption of chromium by dark brown forest soil could reach the balance for as long as eight hours.The adsorption experiment data is fit with Freundlich equation,the order of adsorption to chromium is humic acid>dark brown forest soil>minerals.Under experimental conditions,it's linear distribution adsorption f...