Abstract: This study aimed to evaluate the weed-control efficiency of Flumetsulam for sugarcane plantation and effect of its application on succession crops in the field.The rate of 480 g1 Flumetsulam SC was applied in accordance to the pesticide-guidelines for the experimentation.Effects of the application on sugarcane and the succession crops of rice,corn and Shanghaiqing cabbage were determined.The results showed that the controlling efficiencies on major weeds,such as Digitaria sanguinalis(Linn.)Scop,Echinochloa crusgalli(L.)Beauv.var.hispidula(retz.)Hack,Eleusine indica(Linn.)Gaertn,Centipeda minima(Linn.)A.Br.et Aschers,Solva anthemifolia(Juss.)R.Br.,Mazus japonicus(Thumb.)O.Kuntze,Ageratum conzoides L.,Cardamine hirsute Linn,Polygonum aviculare L.,Fimbristylis aestuvalis(Retz)Vahlhirdute,Portulaca oleracea Linn.and Cyperus rotundus Linn.,were greater than 88% after a 15-day treatment,and 95% after a 30-day treatment.Furthermore,the fresh weight control efficency was more than 95% after a 30-day treatment.The three succession crops,i.e.,rice,corn and cabbage,grew normally in 14 months after the treatment.No significant difference on the crops'production was observed as compared to the control.