Blood glucose level is affected by many factors, such as the amount and type of diet, activity level, sleep and emotion, etc. Therefore, it is difficult to accurately reflect blood glucose status simply by one blood glucose. When reviewing blood glucose, you should maintain your consistent life and medication habits, and do not intentionally reduce food or stop medication, so as not to affect the test results and mislead the treatment. Only measuring fasting blood glucose is not enough, multi-point monitoring should be conducted, including before three meals, 2 hours after three meals, before bedtime, and 2-3 am, in order to get a comprehensive understanding of blood glucose, which helps to adjust the treatment plan and detect nighttime hypoglycemia. Patients with good blood glucose control can be monitored 1-2 days a week. Patients with type 1 diabetes, combined pregnancy, infection status, and other patients with poor blood glucose control should increase the frequency of blood glucose testing to daily monitoring if necessary. For senior patients, especially when combined with cardiovascular and cerebrovascular diseases, bedtime blood glucose is more significant. After testing blood glucose, records should be kept, including time, diet, exercise, medication and other special events that affect blood glucose, such as fever and mood swings. The ideal level of blood glucose control is 4.4-6mmol/l before meal and 4.4-8mmol/l 2 hours after meal. for the elderly and growing children, the standard can be moderately relaxed. In contrast, blood glucose control during pregnancy needs to be more stringent.