How many days it takes for high blood glucose to fall to normal needs to be considered according to the patient’s specific situation, and there is no uniform standard. If it is diabetic ketoacidosis after active treatment can generally be reduced to normal in about a week, if it is diabetes caused by chronic elevation of blood glucose may take weeks or months to fall to normal, it is recommended to follow the instructions of the doctor treatment. Diabetic ketoacidosis requires large amounts of saline rehydration, insulin drip treatment, when the blood glucose drops to 13.9mmol / L can drip glucose and add insulin therapy in proportion, every 4~6 hours to monitor the blood glucose concentration, generally after effective treatment in a week or so after the blood glucose can be reduced to normal. Patients with chronic elevated blood glucose caused by diabetes can have their blood glucose reduced to normal in a few weeks if they are able to follow the medical advice to standardize the use of glucose-lowering drugs, such as metformin, etc., and do a good job of dietary control with appropriate physical exercise. Patients diagnosed with hyperglycemia should actively cooperate with their doctors, and maintain a healthy diet and lifestyle to help promote blood sugar recovery.