After the diagnosis of gestational diabetes, the changes of blood glucose and urinary ketone body should be closely monitored to determine whether the diet and exercise therapy are appropriate, so that timely adjustments can be made to control fasting blood glucose or blood glucose before three meals at 3.3-5.6 mmol/L, blood glucose 1 hour after meals at 7.8 mmol/L, blood glucose 2 hours after meals at 6.7 mmol/L or less is preferable; weight gain of half a pound or 1 pound per week; urinary ketone body is Negative urine ketone body is appropriate. The adjustment period of intensive diet and exercise therapy is 1 week, and after 1 week, if fasting blood sugar >5.6 mmol/L and 2 hours after meal blood sugar >6.7 mmol/L, insulin therapy is used. Through diet therapy and exercise therapy, it is preferable to make pregnant women gain 10-12 kg of weight throughout pregnancy.