Blood sugar 10.9mmol/L is more serious. If it is fasting blood glucose and there are diabetic symptoms, then it can be diagnosed as diabetes, and need to be treated with metformin, acarbose, insulin and other medications; if it is 2-hour postprandial blood glucose, it belongs to the pre-diabetes period, and diet and exercise control is the main focus. Fasting blood glucose ≥7.0mmol/L, or two-hour postprandial blood glucose ≥11.1mmol/L, or random blood glucose ≥11.1mmol/L, or glycated hemoglobin ≥6.5%, can be diagnosed as diabetes mellitus if any of the above items is satisfied and there are “three more and one less” clinical signs at the same time. Diabetes is diagnosed if fasting blood glucose is 10.9mmol/L and there are clinical signs of excessive drinking, excessive eating, excessive urination and weight loss. It needs to be treated with drugs such as metformin, acarbose and insulin under the guidance of a doctor. If the fasting 2-hour blood glucose is 10.9mmol/L, it belongs to pre-diabetes, with diet and exercise control as the main focus, and should be timely lowering of glucose, otherwise it is easy to progress to diabetes. Appearance of blood glucose 10.9mmol / L recommended timely medical care.