Abstract: In order to screen safe and efficient herbicides for leafy vegetables and promote agricultural production,the control effects of three herbicides（acetochlor,dimethoate and pendimethalin）on monocotyledon weeds and dicotyledon weeds and the growth and development of vegetables were studied.The results showed that,in the vegetable field with more monocotyledonous weeds,pendimethalin was more effective as herbicide;and in the case of more dicotyledonous weeds or both types of weeds,dimethylamine was more effective as herbicide.Especially in the process of planting amaranth,it can effectively distinguish plants from purslane and other weeds,reduce the damage to plants,and provide convenience for agricultural production.