Do a good job in daily feeding management, especially the young animals that have not passed the epidemic season of Japanese encephalitis and the animals introduced from non-epidemic areas. Most of these animals are JE-negative and susceptible to infection. Once infected, it will soon produce viremia and become the source of infection. Especially for pigs, the feeding cycle is short and the pigs are updated quickly. Therefore, vaccination should be completed before the epidemic of Japanese encephalitis, and mosquito bites should be prevented as much as possible during the epidemic. Isolation of animals immediately after illness and good nursing can reduce death and promote health.