In order to adapt to the needs of pregnancy, such as the uterus, breast enlargement and the growth and development of the placenta and fetus, the nutritional needs of pregnant women during pregnancy must be higher than those of non-pregnant women. If nutritional deficiencies during pregnancy will not only directly affect the growth of the fetus, resulting in organ underdevelopment, fetal growth restriction and low birth weight and affect the future physical and intellectual development, but also easily cause miscarriage, preterm labor, fetal malformation, fetal death in the womb. For the sake of eugenics, pregnant women should pay special attention to nutrition during pregnancy. 1, thermal energy: pregnant women’s thermal energy supply should be based on protein, fat, carbohydrates to 15U20U65 ratio. According to China’s Han Chinese custom food should account for 65%, the remaining 35% from cooking oil, animal food, beans and vegetables. 2, protein: pregnant women in the 4-6 months of pregnancy should increase the daily intake of protein 15 grams (eat two more eggs a day can); in the 7-9 months of pregnancy should increase the daily intake of protein 25 grams. 3, carbohydrates: after mid-pregnancy, 400-500 grams of staple food per day can meet the needs. 4, trace elements (1) iron: mainly constitutes hemoglobin, but also a component of many enzymes, plays an important role in tissue respiration and biological oxidation process. It is difficult to get the required amount from dietary supplements during pregnancy, so it is recommended to take 0.3g of ferrous sulfate or 0.2g of ferrous fumarate orally once a day since 4-5 months of pregnancy. (2) Calcium: mainly supply the development of fetal bones and teeth, starting from the 16th week of pregnancy, daily intake of calcium 1000 mg, increased to 1500 mg in late pregnancy, to take calcium citrate is better. Because milk and dairy products contain more calcium and are easily absorbed, it is recommended that pregnant women drink more milk and dairy products. (3) Zinc: It is a component of protein and enzyme, and is involved in protein accumulation, which is important for the growth and development of the fetus. If pregnant women do not consume enough zinc in the second trimester of pregnancy, the fetus will be in a low zinc state, which can lead to fetal growth restriction, miscarriage, congenital malformations, and intrauterine foetal death.