Hemoglobin value in pregnancy between 100~109g/L for mild anemia, 6 months of pregnancy found mild anemia to give positive correction, but if there is no effective correction, further aggravation of anemia evolved into moderate and severe anemia will be serious. Fetal growth and development of oxygen and nutrients need to be obtained from the mother, if a pregnant woman with moderate to severe anemia, there will be a placenta supply of nutrients to the fetus can not meet the growth of the fetus, which can easily lead to fetal growth restriction, fetal distress, or even preterm delivery or stillbirth, the impact on the fetus will be great. At the same time, if the anemia is more serious, it will cause myocardial hypoxia of pregnant women leading to anemic heart disease, anemia reduces the tolerance of blood loss and is prone to hemorrhagic shock, and anemia reduces the resistance of pregnant women and is prone to puerperal infections. Therefore, although mild anemia is not serious, it is still recommended to actively correct anemia to prevent the development of moderate or severe anemia.