The placenta is a very important tissue that provides nutrition to the baby and becomes more mature as the pregnancy gets longer. This maturation process is indicated by the maturity level, and most women have reached level 2-3 placental maturity by 36 weeks of pregnancy. Of course, there are some individual differences, some women may still have a grade 1 placenta at 36 weeks of pregnancy, but some women may have a grade 3 placenta at 36 weeks of pregnancy. The higher the maturity of the placenta, the more likely it is to be aging. The first level of the placenta is only a sign of primary aging, the second level is partially aging, but the third level of the placenta is completely aging. Therefore, it is important to pay attention to the ultrasound examination at 36 weeks of pregnancy, which shows that the placenta has reached the third level of maturity, and to strengthen the monitoring of fetal movement and fetal growth and development. To prevent the baby from a series of adverse conditions such as hypoxia and malnutrition, and if abnormalities are found, terminate the pregnancy by early caesarean section if necessary. The maturity of the placenta is related to various factors such as the supply of nutrition to the mother itself, the development of the fetus and the health of the fetus. Therefore, women who are pregnant should take more nutrition and rest, and have regular prenatal checkups to observe the development of the placenta. If the placenta is mature, the fetus is developing well, the fetal movement is normal and there are no symptoms of intrauterine hypoxia, the pregnancy can continue.