To explore the effects of nitrogenous fertilizer and Nadiwen on the control and yield of rice blast and sheath blight, different nitrogen fertilizer and fungicides were applied to each treatment through field plot expert.The results showed that the Nadiwen had good control effect on rice blast and sheath blight, and the control effect increased with increased concentration. Compared with conventional nitrogen application, reducing nitrogen by 20%was beneficial to the control of rice blast. Application of Nadiwen 300 g/ha and reduction nitrogen fertilizer 20%had the best control effect and the highest yield.