First of all, we should know the blood sugar value of normal people, which is 3.9~6.1mmol/L after 8~10 hours of fasting and less than 7.8mmol/L 2 hours after meal. 75g of glucose is commonly used in hospitals for glucose tolerance test, which is the gold standard for diagnosing diabetes. The specific practice is: 75 grams of glucose (provided by the hospital, accurately weighed and sealed beforehand) + 300 ml of water, finished within 5 minutes in fasting state, and blood glucose is tested 2 hours later by drawing venous blood, and the normal person is less than 7.8 mmol/L. Secondly, we need to know what is the target of blood glucose control for diabetic patients. At present, most authoritative diabetes prevention and control guidelines define the target of blood glucose control as follows: fasting 4.4-7.0mmol/L, non-fasting <10.0mmol/L. Non-fasting we may understand as 2 hours after meal, before Chinese meal, before dinner, before bedtime, or any other time (except fasting). The clinical implementation of 2 hours after meal is more operable, but if other time points are used as the criteria, a blood glucose level close to 10.0mmol/L is still too high for most patients. Finally, is there a one-size-fits-all blood glucose control goal for all patients? The answer is no. For patients with new onset or newly diagnosed diabetes and those with a short duration of disease, the blood glucose target should be achieved as early as possible and maintained for a long time. Without hypoglycemia, a near normal blood glucose level is definitely beneficial to health. On the contrary, for patients with long disease duration (such as more than 15 years), serious complications (such as coronary heart disease, stroke, middle and late stage of diabetic nephropathy, severe diabetic fundus lesions), concomitant other serious diseases (such as malignant tumor, advanced stage of liver cirrhosis), advanced age, and patients with recurrent hypoglycemia, etc., the goal of blood glucose control should be appropriately relaxed. After a period of treatment, if the blood glucose does not reach the set target, the reasons can be found in the following aspects. First, for whether the diet is regular. For example, if the same amount of rice or other staple food is cooked into rice and porridge, the effect on blood sugar after ingestion is different. It is suggested that those who eat thin rice may want to reserve a little food as a late addition to avoid the situation of "high blood sugar before and low blood sugar after" (can add a meal about 2 hours after the meal). Whether often irregular meal (snack). In addition, diabetic patients should not overeat. Therefore, it is recommended that patients maintain a relatively constant diet every day. Any changes may result in blood glucose fluctuations, and sometimes a more serious blood glucose fluctuation can affect for several days, requiring new rules to be figured out again. In short, it is crucial for diabetics to manage their diet, and the implementation process does face many challenges, with each meal testing their emotional intelligence and perseverance. Second, for changes in activity levels. Blood sugar will be better controlled when there is more activity, and vice versa. Although exercise is the basic treatment of diabetes, each patient needs to figure out and explore the rules themselves so that diet, exercise and medication can work well with each other. Third, for the drug factor. Inadequate amount of medication, change of dosage form and variety, including changing from oral hypoglycemic drugs to insulin, or from insulin to oral hypoglycemic drugs, or a combination of both, etc., will have an impact on blood sugar and need to be observed and adjusted. Fourth, for the impact of underlying diseases in the body. If there is no major change in the dosage of glucose-lowering drugs, diet and activity, and the blood glucose suddenly rises, special attention should be paid to the possible existence of potential infection or other diseases affecting blood glucose in the body. If combined with hyperthyroidism, which has not been previously diagnosed, hyperthyroidism can additionally raise blood glucose. Colds, pneumonia, and urinary tract infections are sometimes ignored without much concern to oneself, and are only discovered when one arrives at the hospital for examination. Infections can cause a rapid rise in blood glucose due to an increase in the secretion of hormones that raise blood glucose in the body and the failure to increase the dosage of the original glucose-lowering medication in a timely manner. In this case, in addition to appropriately adjusting up the glucose-lowering medication, it is also necessary to treat the new diseases that cause blood glucose fluctuations and to actively control the infection if it is co-infected. There are many other situations that affect blood sugar, such as psychological stress, including insomnia, anxiety, gambling, depression, family or life changes, study and work pressure, when we should fully rely on our own wisdom, as long as timely adjustment of the mindset, and eventually will be able to "tent, win a thousand miles. Diabetic patients, with the prolongation of the disease, the body's own ability to secrete insulin will gradually decline, so blood sugar will rise, and some of the original oral hypoglycemic drugs are gradually resistant or ineffective, you need to change other hypoglycemic drugs to keep blood sugar under control. For a patient who has been fighting with the disease for many years and has been in the battlefield for a long time, usually pay attention to accumulate their own insights, sometimes the above problems can be dealt with without going to the doctor.