Han quaternary amine salts of herbicides to tag type.Effective components of chloroplast membrane is devastating, photosynthesis and chlorophyll synthesis quickly suspended, blade 2-3 hours after the medicine namely began to suffer discoloration, grams of historical trace of single cotyledon and dicotyledonous plants green groups all have strong destructive, there are certain conduction effect green plant tissue damage, but cannot penetrate the bolt qualitative bark, contact with the soil is easily after passivation.Cannot destroy the seed of hidden within the plant roots and soil and weeds have regeneration after applying pesticide.