With the selection of the strong selective internal-suction conductive stem-leaf treatment agent, can be quickly absorbed by the grass weed stems and leaves, and conduction to the apical and nodal division of the tissue, so that its cell division has been destroyed. From the growing point and the node division of the tissue began to necrosis, the drug plant 3 days after the cessation of growth, 7 days after the new leaves fade or appear in the flower Green Plain, 2-3 weeks the whole plant dead. This agent has high choice between Gramineae and dicotyledons, and it is safe for broad leaf crops.