The first dose of varicella vaccine for children is usually given at the age of 12 to 15 months, and the second dose is usually given at the age of 4 to 6 years. 6 to 10 weeks are needed between the two doses for those who have been vaccinated at the age of 13 years or older. Two doses of varicella vaccine are required for the entire course of the vaccine. Usually, children can be vaccinated when they reach 12 months of age and do not have chickenpox (for those who are susceptible to varicella zoster). Chickenpox vaccine can be administered throughout the year, and immunity lasts for 10 to 20 years after vaccination. When children receive varicella vaccine for the first time, it is usually necessary to leave several years between the first and second doses to achieve the effect of strengthening immunity. When children, adolescents, and adults over 13 years of age are vaccinated with varicella vaccine, the two doses should be separated by at least 6 to 10 weeks to achieve better booster immunity. Before chickenpox vaccination, it is recommended to go to a counseling point to learn about contraindications to vaccination and precautions to be taken after vaccination, and those who have already had chickenpox do not need to be vaccinated again.