Abstract: In order to verify and evaluate the control effect, quality improvement and yield improvement of silage maize varieties Yufeng 310 and Jiaduxing 939, 240 g/L of chloroflurane pyrazolate missible oil were sprayed once in maize spot and maize southern leaf blight. The results showed that chloroflurane pyrazolate had a significant effect on the control of maize spot and maize southern leaf blight, and could also increase the stalk coarser and plant height, which had a significant effect on the biological yield of maize silage.