Inhalation vaccine refers to the nebulized inhalation vaccine, which is the latest direction of research on the new crown vaccine, and according to the progress of research and development, there is still a long time to go before it is really put into use in the market. At present, all relevant development units are carrying out the development of the new vaccine of nebulized inhalation type, which has entered the phase 1 clinical trial stage. Moreover, the induced antibody response is similar to that of intramuscular injection, and the formulation of the preparation has not changed, except that it is administered by nebulized inhalation. The nebulized inhalation type of vaccine can safely and conveniently prevent infection and block transmission at the point of viral invasion. According to studies, nebulized inhaled vaccines are well tolerated and have fewer adverse effects, and they also improve immunity in people who have already been vaccinated and do not require a shot to obtain immune protection. The inhaled vaccine is already in clinical trials, and it will take some time before it can actually be put on the market, and the exact timing should also depend on the progress of the clinical trial schedule.