A diabetic fasting blood glucose of 5.5 mmol/L is usually normal. Fasting blood glucose generally refers to the blood glucose concentration measured when there are at least 8~10 hours without food, which can effectively reflect the function of pancreatic islet B cells, indicating the function of basal insulin secretion, and is also a common indicator for detecting diabetes mellitus, diabetic patients control range of 4.4~7.0mmol/L, so diabetic patients with fasting blood glucose 5.5mmol / L is usually normal. Diabetic patients should take glucose-lowering drugs such as acarbose, metformin or insulin injections as prescribed by the doctor in their daily life to stabilize their blood glucose control, and they should also maintain a low-salt, low-sugar, and low-fat diet, and take appropriate physical exercise. Diabetic patients should actively cooperate with the doctor’s treatment, and if abnormal blood glucose values occur, it is recommended to go to the hospital for consultation.