The experiment results in this report are summariued as follows:1.Both of the reduction treatments (with glucose) and chelatim treatments (with oxalic acid) could aotivate and remove certain amount of Fe₂O₃ or Al₂O₃ from the soil and deteriorated the soil structure containing macro- and micro-aggregates.2.The reduction-chelation treatments (with citrate-dithionitc:solution)could activate and remove a large amount of Fe₂O₃ and Al₂O₃ and strongly deteriorated the soil structure.