This study selected E. crugalli、L. chinensis、E. prostrata and C. difformis for research, and tested activity of herbicides to these 4 weeds in the greenhouse condition. Greenhouse experiments showed that Benthiocarb had the highest inhibition to E.crugalli and L. chinensis, Pyridine-ethyl had the highest inhibition to E. prostrata and C. difformis. We got the optimum proportion of these 2 herbicides; and defined the formula composition and processing of the oil flowable concentrate; control technology of we...