Planned immunization refers to the vaccines provided by the government to citizens free of charge, also known as Class I vaccines, which citizens should receive free of charge according to government regulations. Planned immunization vaccines are selected by the state based on the epidemic surveillance reports of infectious diseases and the analysis of the findings of the immunization level of the population, and are planned to classify the population by age and provide routine vaccination to improve the immunization level of the population, so as to serve the purpose of controlling or even eventually eliminating the corresponding infectious diseases. The vaccines currently planned for immunization in China include hepatitis B, BCG, sugar pills, Bai Bai Bao, measles, hepatitis A, etc. The vaccines planned for immunization have a certain relationship with the economic level of the country.