Too many vaccines will not reduce the body’s immunity, which is mainly related to nutritional levels, underlying diseases and other factors. Too much vaccine will not affect the body’s immune ability. The main components of vaccines include pathogenic microorganisms (e.g. bacteria, viruses, etc.) or their structural components that have been artificially attenuated, inactivated, or processed using genetic engineering technology, and do not contain components that will damage the human immune system. After entering the human body, the main function is to stimulate the human immune system and produce antibodies to achieve the purpose of disease prevention, rather than damaging the immune system. In addition, the level of immunity is mainly related to the level of nutrition, the underlying disease and other factors, such as protein, vitamins and other intake of adequate, the immunity can be relatively enhanced; the existence of the underlying disease of the population, especially immunodeficiency diseases, the immunity is lower than that of the population without the underlying disease, and has nothing to do with the number of vaccinations. Before vaccination, it is necessary to consult the physician of the vaccination center in detail, and only those who have no contraindications to vaccination and meet the conditions for vaccination can be vaccinated.