Effects of the growth of Mimosa pudica,Tradescantia sill amontana and Porulaca afraon soil enzyme activities of cadmium contaminated soils were studied by pot experiment.The results showed that soil urease,catalase and poly phenol oxidase activities decreased gradually with the increase of Cd concentration.There was a significant negative correlation between Cd concentration and soil enzyme activities.Wit h the seedlings growth of these three kinds of ornamental,the activities of urease,catalase and poly phenol oxidase increased,and followed the order of urease>poly phenol oxidase>cat alase>invert ase.Besides,Tradescantia sill amontana could also improve soil invertase activity.The effect of Tradescantia sill amontana on soil enzyme activities was higher than the other two ornamental.As a common ornamental plant,Tradescantia sill amontana may have great value in remediating cadmium contaminated soil.