High fasting glucose without high postprandial glucose may be due to impaired fasting glucose regulation, improper use of glucose-lowering drugs in diabetic patients, and the dawn phenomenon. 1. impaired fasting blood glucose regulation: that is, fasting blood glucose between 6.1~7.0mmol/L and blood glucose ≤7.8mmol/L after 2 hours of glycemic load. belongs to prediabetes. Its treatment includes increasing exercise to improve insulin resistance; adjusting dietary structure such as balanced nutrition, proper intake of high quality protein, eating more fresh vegetables, etc.; and using drugs such as metformin under the guidance of doctors if necessary. 2. Improper use of hypoglycemic drugs: Some diabetic patients use hypoglycemic drugs with short half-life, which is not enough to maintain normal blood glucose level for a long period of time, so the phenomenon of high fasting glucose and low postprandial glucose may occur. 3. Dawn phenomenon: that is, the blood sugar control is good at night, and there is no hypoglycemia phenomenon, only in the dawn there is a transient hyperglycemia, which may be due to the excessive secretion of free cortisol, growth hormone, etc. in the early morning. There may be other reasons for high fasting blood glucose and low postprandial blood glucose, and when this happens, you should go to the hospital in time and under the guidance of the doctor to avoid the condition from deteriorating.