The normal fasting blood glucose value is 3.9-6.1mmol/L; the 1-hour postprandial blood glucose is 6.7-9.4mmol/L, up to 11.1mmol/L; the 2-hour postprandial blood glucose value should be less than 7.8mmol/L. The current diagnostic criteria for diabetes are postprandial blood glucose greater than 11.1mmol/L and fasting blood glucose greater than 7.8mmol/L. The diagnosis of diabetes is made. Therefore, blood sugar of 16mmol/L, whether fasting blood sugar or 2 hours postprandial blood sugar, has reached the diagnosis standard of diabetes. However, if the fasting blood glucose is more than 16mmol/L, it means that the blood glucose is more high, which is a more serious situation. If the patient’s blood sugar is in greater than 16mmol/L for a long time, it belongs to obvious hyperglycemia, which may trigger macrovascular disease of diabetes, such as arteriosclerosis, heart attack, myocardial necrosis brain infarction and other diseases. In addition, it is likely to cause a series of diabetic complications, such as acute diabetic ketosis, diabetic ketoacidosis, diabetic retinopathy, diabetic nephropathy, diabetic foot, etc. If the patient has a previous skin breakdown, tuberculosis, infection, etc., it may cause the wound area to be prolonged. Therefore, if a patient has postprandial blood glucose of 16 mmol/L, it is recommended that the patient should have timely treatment and focus on lifestyle improvement to avoid further aggravation of the disease. In case of high blood glucose, patients are advised to visit the hospital in time and take effective glucose-lowering treatment plans under the professional guidance of doctors, whether using oral medication or insulin therapy, all need to follow the standardized principles. In addition, patients are advised to follow medical advice to monitor fingertip blood glucose, including fasting and 2-hour postprandial blood glucose, and to adjust the treatment plan according to the results of blood glucose monitoring in a timely manner. In addition, diabetic patients need to pay attention to lifestyle adjustment. In terms of diet, it is recommended to eat less and more meals, try to control the amount of staple foods and consume more vegetables, while controlling the intake of fruits, sweets and thin rice. Patients are advised to exercise properly, such as swimming, running, brisk walking, etc. These exercises are important for controlling blood sugar. Most importantly, patients need to review their blood glucose values regularly to avoid complications of diabetes.