Influenza vaccine has a certain role in making the body produce antibodies against the influenza virus, in general, children play a protective role. The harm of influenza vaccine for children, generally mainly manifested as certain side effects, mainly manifested in the following aspects: 1, local reactions, vaccination common local reactions include the pain of the vaccination site, or the emergence of local allergic reactions to vaccines, this situation is generally in 2 to 3 days can disappear on their own, do not need further medical measures. 2, mild adverse events, on the whole, most of the influenza vaccination can not cause disease, but there are some patients in the influenza vaccination after the coupling reaction. This is generally still the main antiviral and other symptomatic treatment. 3, systemic reaction, generally very few systemic reaction, there are a small number of patients with mild systemic reaction, fever, malaise and muscle pain, most of these reactions generally occur in 6-12 hours after vaccination, lasting 1-2 days, generally the main symptomatic treatment can be. In short, pediatric influenza vaccination will have certain side effects or harm, but its role in the prevention of influenza, should still be the main, the benefits outweigh the disadvantages.