Abstract: In order to explore the mitigation effects of different passivating agents on Fucheng Ophiopogon japonicumcadmium pollution,method of pot planting Fucheng Ophiopogon japonicus were used.Polluted soils were mixed with straw biochar in the selected farmland soil（Br）,fly ash（Fh）,white marble（Ar）,diatomaceous earth（Dm）and mushroom residue（Me）as experimental groups,and local polluted soil without adding any passivation agent as a control group for planting it.The effect of passivating agent on the leaf growth of Fucheng Ophiopogon japonicus were observed and the content of chlorophyll,malonaldehyde（MDA）content,protective enzyme activity,soluble protein and soluble sugar content were determined.The results showed that the leaf length,which treated with straw biochar,was longer than that of the control group.The catalase（CAT）activity of Ophiopogon japonicus leaf cells was significantly increased by straw biochar.However,the activities of superoxide dismutase（SOD）and peroxidase（POD）of Ophiopogon japonicus leaf cells treated with passivating agent were not increased.Except for the bacterial residue,the other four passivating agents could alleviate the increase of MDA content under cadmium pollution.Treated with the straw biochar increased the antioxidant level of Ophiopogon japonicus leaves,mitigated the harm of cadmium pollution to Fucheng Ophiopogon japonicus.