Influenza B is a disease caused by infection with influenza B virus, so prevention should be carried out through the following aspects: 1, indoor windows should be frequently opened and ventilated to keep the air clear to avoid the accumulation of viruses; 2, the peak of the influenza season should try to avoid going to crowded public places to avoid infection with the influenza virus; 3, strengthen outdoor exercise to improve the body’s resistance; 4, pay attention to personal hygiene, to Wash your hands frequently to avoid contaminated hands touching your mouth, eyes and nose; 5, winter and spring climate change is relatively fast, to increase and decrease clothing in time to prevent the flu; 6, winter and spring to drink more water and eat more light food; 7, the elderly and children should be vaccinated against influenza in advance, so that the body produces antibodies to prevent the flu.