Fasting blood glucose of 3.9 to 6.1 mmol/L is usually normal for pregnant women. The normal range of fasting blood glucose for pregnant women is 3.9-6.1mmol/L, and the normal value of 2-hour postprandial blood glucose is <7.8mmol/L. Pregnant women can take 75 grams of oral glucose tolerance test at 24 to 28 weeks of pregnancy, and diabetes can be diagnosed when the fasting blood glucose reaches or exceeds 5.1mmol/L, or the blood glucose value reaches or exceeds 10.0mmol/L one hour after oral glucose, or the blood glucose value reaches or exceeds 8.5mmol/L two hours after oral glucose. In order to prevent the phenomenon of elevated blood glucose, pregnant women must control their blood glucose, avoid foods that are too high in sugar, such as cakes and chocolates, avoid greasy and fried foods, control their daily energy intake, moderate physical exercise, reduce weight reasonably, and develop a healthy lifestyle. Women who are preparing for pregnancy are advised to control their blood sugar under the guidance of a doctor and prepare for pregnancy after controlling their blood sugar to the desired level.