Patients with type 1 and type 2 diabetes are advised to keep fasting blood glucose levels around 4.4 to 7.0 mmol/L. A non-fasting blood glucose target of <10.0 mmol/L is a reasonable range. So 2 hours after meal blood glucose should be controlled under less than 10 mmol/L. If there are complications, the specific blood glucose range should be controlled according to medical advice. The normal value of blood glucose level 2 hours after meal should be <7.8mmol/L. Under normal circumstances, the corresponding range of blood glucose in fasting is 3.9-6.1mmol/L, 6.1-7.0mmol/L belongs to the impaired fasting blood glucose; the value of blood glucose 2 hours after meal should be <7.8mmol/L, 7.8-11.1mmol/L belongs to the impaired glucose tolerance. The 2-hour postprandial blood glucose value is one of the bases for the diagnosis of diabetes mellitus, and the latest criteria for the diagnosis of diabetes mellitus are the typical "three more and one less" symptoms plus the measurement of venous plasma glucose ≥11.1mmol/L or fasting glucose ≥7.0mmol/L at any time of the day, or the glucose ≥11.1mmol/L at 2 hours after the glucose tolerance test (OGTT). Blood glucose ≥11.1 mmol/L, and diabetes is diagnosed when one of these three items is met. When there is an abnormality of blood glucose 2 hours after meal, you need to go to the hospital in time, under the guidance of the doctor for further examination, to clarify the cause of the disease and then carry out appropriate treatment. If you feel unwell, consult a doctor promptly.