Blood glucose monitoring for diabetic patients is an important measure for patients’ self-management, and a reasonable monitoring time provides an accurate basis for blood glucose adjustment. The details are as follows: 1. It is recommended to monitor eight segments of blood glucose when available, before three meals, 2 hours after three meals, at night at 10 o’clock, and around 2-4 am; 2. Fasting means 8-12 hours of abstaining from any calorie-containing food, and it is recommended not to eat after 10 o’clock; 3. 2 hours after meals means 2 hours from the first bite; 4. Before monitoring three meals, it is recommended to monitor 10-15 minutes before meals; 5, Monitor the complete eight segments of blood glucose once in 1-2 weeks; 6. Need to pay attention to the use of medium and long-acting insulin, make sure to monitor the blood glucose before bedtime and early morning to prevent the occurrence of nighttime hypoglycemia.