1. On the basis of rational arrangement of diet, to achieve healthy and scientific eating habits. On the basis of dietary nutrient balance to reduce the total daily intake of calories, the principle of low energy, low fat, suitable for high-quality protein (such as fish, eggs, soy products, chicken, milk, etc.) and carbohydrates, proteins and fats provided by the proportion of calories for 60-65%, 15-20%, 25%, respectively, in order to reduce the fat (such as fatty meats, offal, egg yolks, nuts, vegetable oils, etc.) is the main. Each meal is not full, seven or eight can be, not overeating, chewing and slow swallowing, extend the eating time, especially pick low-fat food, eating with small utensils, increase the sense of satisfaction, according to the eating plan to plan each meal food, can eat more meals to complete the daily plan, can reduce hunger, after pregnancy does not advocate weight loss. 2, to strengthen sports and exercise. Exercise and exercise to moderate or low intensity exercise is appropriate, because of the increase in muscle oxygen consumption, exercise a few hours after the oxygen consumption is still greater than when quiet, and easier to adhere to than strenuous exercise, such as brisk walking, jogging, playing badminton, table tennis, dancing, swimming and so on. 3, too light weight is not good. There are many modern women who pursue a slender figure, often dieting, so that the body lacks certain nutrients. And whether the eggs can be fertilized has a lot to do with their vitality. If the nutrition is insufficient, the vigor of the eggs will be reduced, or the menstruation will be irregular, resulting in difficulty in conception. Moreover, insufficient nutrition before pregnancy will also affect the development of the embryo that has just formed at the beginning of pregnancy. At the beginning of pregnancy, it is the period of differentiation of the heart, liver, kidney, intestines, stomach and other important organs, and the brain is also developing rapidly, and it is necessary to obtain a variety of adequate nutrition from the mother, and these nutrients need to be stocked up by the mother in the pre-pregnancy period, or the early development of the fetus will be affected, such as the increase in the chances of low-birthweight babies or developmental malformations. In addition, insufficient pre-pregnancy nutrition will also affect breast development, resulting in insufficient lactation after delivery and affecting breastfeeding.