From 1989~1990, the demonstrating experiment of dimethazone was conducted in soybeanfields with single usage and mixtures at 10 locations in the east parts, middle parts and west parts ofJilin province. The demonstrated areas were more than 13ha. The results indicated that dimethazonewas effective against annual Gramineae weeds and broadleaves in soybean fields and did not affectthe emergence and growth of soybean. The dimetnzone could stably control 80% of the field weedsand it is one of the best soil-treated herbicides. It is recommended that the dimethazone be used tocontrol the weeds of soybean field in Jilin province.