It is normal for the placenta to be more than 2cm from the endocervical opening. Clinical examination of the distance between the placenta and the cervical opening by negative ultrasound is more accurate, and in general, the placenta is considered to be in a normal position if it is more than 2cm away from the cervical opening. Placenta covering the lower part of the uterus or endometrium after 28 weeks of gestation is known as placenta praevia, which can be categorized into four types, central placenta praevia, partial placenta praevia, low placenta praevia, and borderline placenta praevia. The main risks of placenta praevia are painless vaginal bleeding in late pregnancy, anemia, hemorrhagic shock, postpartum hemorrhage, and neonatal asphyxia and preterm delivery. If the distance between the two is found to be less than 2cm in early pregnancy, there is usually no need to be overly anxious because as the uterus enlarges, the fundus of the uterus continues to extend upwards and the placenta moves, making placenta praevia less likely to occur. If placenta praevia is detected after 28 weeks of pregnancy, it is necessary to actively follow the doctor’s instructions for targeted treatment, and if necessary, terminate the pregnancy.