A pot culture experiment was carried out to study effects of 100 mg kg^-1 DEHP on dehydrogenase activity and microbial diversity in Fimi-Orthic Anthrosols,as well as effects of mung bean planting on DEHP toxicity.DEHP-treaunent significantly depressed dehydrogenase activity,which decreased by about 30% after 30 days,and then increased slightly after 60 days,but was still lower than that in the control(p<0.05).The BIOLOG results show that Shannon index,Simpson index,McIntosh index and evenness of soil microbial communities were all significantly lower in the DEHP-treated soil than in the control,which indicated that DEHP pollution decreased functional diversity of the soil microbial communities.Mung bean planting enhanced dehydrogenase activity and soil microbial activity,alleviated bnt did not completely eliminate the toxicity of DEHP.