The third vaccine is usually a booster shot of the New Crown vaccine. Stable diabetic patients can have a booster shot of the New Crown vaccine, but it is not recommended if the diabetic patient’s blood glucose is too high or if there are acute complications such as diabetic ketoacidosis. If the diabetic patient’s blood glucose control is relatively stable, then his or her own immune system function is also relatively stable, and he or she can play the normal immune mechanism just like other people, then he or she can get a booster shot of the New Crown vaccine. However, if the diabetic patient’s own condition is poor, weak immunity, unsatisfactory glycemic control, and acute complications such as diabetic ketoacidosis, it is not recommended to get a booster shot of the new crown vaccine. When diabetic patients receive the third booster shot, it is also necessary to rule out contraindications to the new crown vaccination, such as having allergies, being febrile, and so on. Blood glucose control needs to be stabilized before a booster shot of the new crown vaccine can be given. It is recommended that diabetic patients consult a medical professional as to whether they can receive the New Crown vaccine.