Placental MRI requires the pregnant woman to choose the proper position to lie on the MRI bed to scan and image the placenta. Some pregnant women experience malposition of the placenta during pregnancy, such as placenta praevia and menacing placenta praevia, and the purpose of the placental MRI is to look at the position of the placenta and whether or not it is implanted in the surrounding tissues. Before having a placental MRI, all metal accessories need to be removed, and then the imaging doctor will bring the patient into the MRI room, lying on the examination bed, the position is usually supine, some pregnant women are prone to low blood pressure because of the large gestation period, they can also choose the side position, and under the guidance of the doctor with the respiratory exercises, which will help to improve the quality of the placenta MRI image. Placental magnetic resonance examination is a special auxiliary examination, which needs to be conducted by the doctor after a comprehensive assessment of the condition.