MMR vaccine belongs to China’s national planning immunization vaccine, eligible for vaccination must be vaccinated. The MMR vaccine is known as Measles Mumps Rubella Combined Live Attenuated Vaccine (MMR LAV), which is used to immunize people over 8 months of age against Measles, Rubella and Mumps (MMR) Hepatitis B. Normally, the unimmunized population is generally susceptible to the Measles, Rubella and Mumps (MMR) viruses. Since this vaccine is a nationally planned immunization vaccine, it is free and mandatory for school-age children. It should be noted that there are contraindications to the vaccine, such as allergy to the components of the vaccine, a history of allergy, or an exacerbation of the disease, and parents need to pay extra attention to avoid incorrect vaccination.