Short-acting insulin 5 units at a time, three times a day belongs to the normal dosage of drugs, and can not judge the severity of diabetes, should be judged according to the specific conditions, such as type 1 diabetes, may be more serious. Short-acting insulin is usually given three times a day, starting about 30 minutes before each meal, and the dose can be adjusted accordingly to the patient’s blood glucose. Short-acting insulin works faster and can control postprandial blood glucose well. Commonly used insulins include such as insulin menthyl and insulin lysine. Indications for the use of insulin include high blood glucose at the early onset of diabetes mellitus, poor glucose-lowering effect of multiple oral drug combination therapy, diabetes mellitus combined with acute infections, type 1 diabetes mellitus patients and so on. Therefore, insulin treatment can not determine the severity of diabetes, such as pancreatic islet function is still good, in the period of glucotoxicity temporary use of insulin, is not serious, such as type 1 diabetes mellitus, it may be more serious. It is recommended that patients use short-acting insulin under the guidance of a doctor.