The maturity of the placenta is indirectly reflected in the maturity of the fetus, according to the ultrasound image of the placenta, the placenta can be classified into I-III. Grade I placenta is mostly seen before 33 weeks and does not need to be reported. Grade II placenta: the placental chorionic plate extends into the placental tissue, but has not reached the basal layer, it is curved and lace-like, the basal plate and the chorionic plate appear as linearly arranged echogenic enhancement dots, The placenta parenchyma shows short columnar reflective echogenicity, and the basement membrane shows dotted enhancement echogenicity, accounting for 10%-25% of the placental surface on average. grade III placenta: the placental chorionic membrane is deeply indented into the placental tissue, with hard nodules, the basal plate is mostly fused with the chorionic plate, and the placental parenchyma shows a fused halo, with hypoechoic or liquid dark area inside the ring, and the basement membrane shows fused stripes or The basement membranes are seen to be fused with each other in the form of striated or speckled enhancing dotted echogenicity, accounting for 50% or more of the placental surface on average. If the placenta is fully mature, it reflects the maturity of the fetus, and generally the placenta reaches grade III at about 36 weeks of gestation. 34 weeks of placental maturity grade III is slightly early, which may indicate poor placental function, if it is accompanied by small fetal biparietal diameter and short femoral length, we should pay attention to intrauterine growth retardation, and we can use drugs to unblock the placental microcirculation to improve fetal nutrition supply. At the same time, we should pay attention to the change of fetal movement and ultrasound to review the change of amniotic fluid volume to prevent the occurrence of severe intrauterine fetal hypoxia. However, ultrasound examination has certain errors, and the time of birth may not coincide with the expected date of delivery. If the biparietal diameter and femoral length and other indicators such as amniotic fluid volume are normal, there is no need to worry too much. The placenta is diagnosed to be calcified if small and hard particles are visible to the naked eye and feel sandy when touched and cut, otherwise it is designated as no obvious calcification. It is generally believed that placental calcification is a form of physiological degeneration of placental aging, an important manifestation of placental aging and an inevitable process of placental development. It is believed that placental calcification is the first part of placental aging or a manifestation of placental aging, which is due to focal infarction of the placenta in late pregnancy. All possible means should be taken to detect the condition of the fetus, and the management of the pregnancy has been decided. In the presence of diseases such as overdue pregnancy, gestational hypertension, diabetes mellitus, chronic nephritis, etc., the patient should be hospitalized immediately. Because calcification of the placenta in pregnant women with combined diseases means that the function of the placenta in transporting nutrients is reduced, the fetus may stop growing or even die, and therefore calcification of the placenta in these pregnant women is dangerous for the fetus. It is best to monitor the fetal movement of pregnant women, which is normal if it is greater than or equal to three times per hour, and to consult a doctor if it decreases.