The study indicated that 4% Yunongle was a perfect herbicide used to spray the leavies of weeds,which was better than Xiuqujin.If 4% Yunongle（1.125～1.5L/hm² ）is used before the five-leaf-period of weeds,it can control the harm of weeds in corn field by single spray.The mixture of Yunongle and Xiuqujin strengthen the weed-control effect.The mixture of 4% Yunongle （0.75L/hm² ）and 40% Xiuqujin（1.2L/hm² ）can also control the harm by single spray.