The rapid weight gain of pregnant women, especially in the second trimester, i.e. 6-7 months, may be crazy, generally related to excessive fetal growth, in addition to the need to be alert to sudden edema and weight gain due to hypertensive disorders of pregnancy. Due to the rapid fetal growth leading to the recent crazy weight gain, it is not recommended for pregnant women to lose weight at this time. However, weight gain during pregnancy should not be unrestricted and needs to be properly controlled. It is recommended to reduce energy intake and exercise appropriately when physical condition allows and the mother and child are in stable condition. Pregnant women can do aerobic exercise daily or 3-4 times a week, but they should discuss with their doctor before starting exercise. If you are not used to exercise, you can choose to take a walk after dinner, which is good for food digestion. In addition, you can also do appropriate household chores and keep your place clean to make you feel better. At the same time, it is necessary to maintain a reasonable diet and nutrition, a small number of meals, should not overeat, and appropriately increase the intake of calcium-rich milk and protein-rich fish, poultry, eggs, lean meat, and increase the intake of vegetables rich in vitamins and fiber, so as to ensure a reasonable nutrition and balanced diet. Pathological state of pregnant women with gestational hypertension disease, kidney disease, etc. will lead to edema, often accompanied by hypertension, placental abruption, fetal growth restriction, HELLP syndrome, cerebral hemorrhage and other complications, in serious cases may endanger the life of the mother and child, need timely medical treatment, if necessary, termination of pregnancy. In conclusion, rapid weight gain in late pregnancy requires vigilance, and weekly weight monitoring is still needed after excluding pathological conditions to ensure adequate nutrition for fetal growth and development, as well as to ensure moderate and uniform weight gain every week or every month.