Diabetic ketoacidosis should focus on prevention. Good long-term control of blood sugar and prevention of infection and other incentives are the main preventive measures. Because the most common inducement of diabetic ketoacidosis is infection, other inducements include the interruption of insulin treatment or inappropriate dosage reduction, various stresses, alcoholism, and the use of certain drugs, such as glucocorticoids, sympathomimetics, etc. In addition, 2% to 10% of diabetic ketoacidosis have unknown causes. Good control of blood sugar can not only avoid the occurrence of diabetic ketoacidosis, but also delay the occurrence and development of chronic diabetic complications, such as diabetic nephropathy, diabetic retinopathy, diabetic neuropathy, etc.