Anemia is the decrease of hemoglobin in the body, which is called anemia when it is below 100g/L for women, 110g/L for adult women and 120g/L for adult men after pregnancy. There are many reasons for anemia, if it is caused by malnutrition, the most common one is iron, because iron deficiency causes insufficient hemoglobin, it is called iron deficiency anemia. It accounts for 85% of the whole causes of anemia in pregnant women, so it should be very significant in terms of epidemiology and in terms of the treatment of etiology. Therefore, pregnant women should eat more iron-containing foods appropriately during pregnancy. Another thing is to take regular iron supplementation during pregnancy, 60mg of elemental iron per day, to prevent iron deficiency anemia. Women with abnormally increased menstruation are also prone to iron deficiency anemia.