Encephalitis B virus is an arbovirus, and the main vector is mosquitoes, including Anopheles and Aedes mosquitoes, etc. It is mainly transmitted through mosquito bites on people or livestock with the encephalitis B virus, and the virus is spread in mosquitoes by re-biting other people and animals. Encephalitis B virus can lead to severe encephalitis symptoms in children and young adults, and some patients will be left with sequelae. Therefore, it is very important to eliminate mosquitoes in order to cut off the transmission pathway. Encephalitis B virus belongs to a class of infectious diseases, the spread of seasonal, regional characteristics, occurring in the summer and fall, mosquito season, and is mainly prevalent in special zones, such as the tropical areas of southern China.