Abstract: Taking Ruipu 908 as the research object, the effects of spraying "Yuhuangjin" on lodging resistance and yield of maize were studied. The results showed that the maize yield increased by 16.06% on average when "Yuhuangjin" was applied in the jointing period of summer maize. It was effective in improving lodging resistance and photosynthetic capacity of ear leaf of maize.