At present, hepatitis B vaccination has been popularized in China, but we cannot think that it is safe to have been injected. Generally, we have to see whether the injection has produced hepatitis B surface antibody, that is, the second item in the two pairs of hepatitis B, which is often referred to as HbsAg on the laboratory test; whether it is positive, and also to see whether its titer is high or low enough, generally it should be more than 10. If the second item is not positive or the titer is not enough, you need to inject hepatitis B vaccine again, and if you are negative, you need to inject 3 times according to the time of 0, 1, 6, i.e. 1 month after the first injection and 2, 3 injections after 6 months, if the titer is not enough, you can inject 1 time, if the titer is enough, you need to review it every 2 years afterwards, if the titer drops, you need to inject again. For those who are susceptible and at high risk, it is more important to pay attention to them.