Abstract: The comparative experiment on the application of soil decontaminant Ronbao was performed to determine its effect on the yield and economic returns of the sweet corn, tomato and green pepper. The results showed that under the application of soil decontaminant Ronbao, the yields of the sweet corn, tomato and green pepper increased respectively by 19.9%，20.1% and 15.5%, and the economic returns of the three crops respectively raised 10.9%, 17.5% and 13.8% than their controls. In addition, soil decontaminant Ronbao, when applied in the greenhouse, will have a better yield-increase effect due to its control effect on soil-borne diseases and soil obstacle factors.