If high blood sugar or gestational diabetes occurs during pregnancy, it can be treated in many ways, such as diet, exercise and insulin injection, and there is no such thing as the best way. 1. Diet therapy: mainly avoid or reduce the consumption of high-sugar and high-carbohydrate foods, such as fruit sauce, honey, pastries, rice, etc., can be appropriate to increase the intake of coarse grains and miscellaneous grains, but also the use of meal portioning, that is, small meals, so as to maintain blood glucose in a relatively stable state. 2. Exercise therapy: Appropriate exercise, some kind of low to moderate intensity aerobic exercise (such as jogging, brisk walking, etc.) after 30 minutes of each meal can help to control body weight during pregnancy and reduce basal insulin resistance during pregnancy. 3. Insulin injection: For pregnant women who have poor glycemic control through diet and exercise, the application of insulin is first recommended for glycemic control, but attention should be paid to the risk of hypoglycemia. During pregnancy, attention should be paid to strengthening the monitoring of blood glucose, and once gestational diabetes mellitus occurs, one should also actively control blood glucose under the guidance of physicians, and after the blood glucose is under control, it is also necessary to carry out obstetric examination on a regular basis, in order to monitor the health of the mother and child.