Trifloxysulfuron belongs to sulfonylurea herbicides, weeds can be absorbed by roots, stems, leaves after application, it can be conducted up and down in plants by inhibiting acetolactate synthase (ALS) activity, thus affecting the branch chain amino acids (such as: leucine, isoleucine, valine) biosynthesis. After the plant victims showed growing point necrosis, vein chlorosis, plant growth is severely inhibited, dwarf, eventually the whole plant dead. Trifloxysulfuron selective weed and crop degradation is mainly due to differences in metabolism. Which can be rapidly metabolized in vivo as cotton and sugar cane inactive substance, so that the crop plants from harm. Of endive (chicory dish), quinoa (Chenopodium album), small quinoa, Chenopodium quinoa, purslane, Amaranthus, concave head amaranth, Amaranthus green, thistle, thorn bud fruit, ragweed, Bidens large Alondra, water, peanuts, rapeseed field, field bindweed, Calystegia, fruit, sweet wine intestine (Eclipta), Sesbania, Ageratum, Yu Mang Ju, Brachiaria, spurge , presses shall burst sorrel (Mimi acid) and other broadleaf weeds has good control effect; for purple nutsedge (nutsedge) have effects; crabgrass, barnyardgrass drought, goose grass, green foxtail, sorghum and other cereal poor weed control.