The Cr( VI)adsorption effect of rice straw modified by much reagent were discussed. The Cr ( VI)adsorption rate of rice straw modified by reagent is higher than alkalization rice straw modified by reagent. If only take into account adsorption rate,the good sequence of modified reagent is as follows:ani-line﹥epichlorohydrin plus ethylene diamine﹥ethylenediamine﹥hydrogen peroxide﹥hydrogen peroxide plus ethylene diamine ﹥potassium permanganate ﹥citric acid ﹥phosphoric acid ﹥EDTA ﹥ epichloro-hydrin﹥formaldehyde﹥nitric acid. If take into account adsorption rate,the complexity of modified tech-nics and environmental property of modified technics,the good sequence of modified reagent is as follows:aniline﹥ hydrogen peroxide﹥citric acid﹥phosphoric acid﹥potassium permanganate﹥hydrogen perox-ide plus ethylene diamine﹥epichlorohydrin﹥ethylene diamine﹥epichlorohydrin plus ethylene diamine﹥EDTA﹥formaldehyde﹥ nitric acid. The selected modifier,aniline modified rice straw on the adsorption rate of Cr6+ is highest,hydrogen peroxide modified straw modification technology is the most environmen-tally friendly.%详细探讨了各种改性剂改性稻秆对Cr6+的吸附效果。改性剂改性未碱化稻杆对Cr6+的吸附率高于改性剂改性碱化稻杆。改性剂改性稻杆对Cr6+的吸附率高低顺序为：苯胺﹥环氧氯丙烷加乙二胺﹥乙二胺﹥双氧水﹥双氧水加乙二胺﹥高锰酸钾﹥柠檬酸﹥磷酸﹥EDTA﹥环氧氯丙烷﹥甲醛﹥硝酸。综合考虑改性剂改性稻秆对Cr6+的吸附率高低，改性工艺的复杂程度，以及改性工艺的环保性，得出改性剂改性稻秆的综合性能高低顺序：苯胺﹥双氧水﹥柠檬酸﹥磷酸﹥高锰酸钾﹥双氧水加乙二胺﹥环氧氯丙烷﹥乙二胺﹥环氧氯丙烷加乙二胺﹥ EDTA﹥甲醛﹥硝酸。苯胺、双氧水是综合性能非常好的两种改性剂，在所选改性剂中，苯胺改性稻秆对Cr6+的吸附率最高，双氧水改性稻秆的改性工艺最环保。
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