Whether it is normal for a pregnant woman to have a placenta class II at 33 weeks of pregnancy needs to be judged in the light of the specific conditions of her fetus and the pregnant woman. Generally speaking, before 36 weeks of pregnancy, the placenta is graded as Grade I. If the placenta enters Grade II early at 33 weeks, it may suggest that the placenta is mature, and at this time, if the size of the fetus, the fetal heart rate, fetal movement and other indicators are within the normal range, it means that the fetus is developing well, and there is no need to worry too much. Pregnant women need to pay attention to rest, strengthen nutrition, regular obstetrical examination, and keep abreast of the situation of the fetus. If placenta class II occurs at 33 weeks of pregnancy, along with decreased fetal movement, fetal heart rate, and abnormal amniotic fluid, it may suggest that the placenta is premature, the blood supply and oxygen supply in the placenta are reduced, and the transmission of nutrients is impaired, and the fetus may have developmental delay or stop developing. Pregnant women need further examination to determine the condition of the placenta, as well as early hospitalization, regular oxygen intake, close monitoring of the fetus, and early termination of pregnancy if necessary. Usually, the grading of the placenta is a judgment based on the different manifestations of the placenta under ultrasound, which may differ from the true function of the placenta. Therefore, when judging the maturity of the placenta under ultrasound, it is necessary to take into account other parameters and clinical data to arrive at an accurate result, and not to make generalizations.