Usually the placenta class II at 28 weeks of pregnancy may or may not be normal and needs to be analyzed comprehensively. The placenta is an important organ for the exchange of materials between the fetus and the mother. Starting from the late stage of pregnancy (28 weeks), the placenta grading will appear on the ultrasound report card, and most of the placenta grades at this time are 0-I, and the placenta grades can be I-II at around 36 weeks, and II-III at around 40 weeks. Generally speaking, the placenta above grade II suggests that the fetus tends to mature, if the placenta reaches grade III, it indicates that the placenta has matured and tends to age. If the placenta is grade II at 28 weeks of pregnancy, it needs to be combined with the condition of the fetus to judge, if the fetus grows and develops normally, it may be normal, and it is enough to have regular checkups, and if the fetus grows and develops retardedly, it does not rule out the possibility of the decline of the placenta’s function. Placental grading is only an ultrasound imaging distinction, can not be used as a basis for judging the intrauterine condition of the fetus, need to be analyzed comprehensively, it is recommended that there are abnormalities in a timely manner to consult the doctor.