A high and low pelvis after delivery is considered to be caused by deformation of the pelvic bones during pregnancy and delivery, resulting in excessive anterior tilt of the pelvis, and there may also be hip joint pathology. In the middle and late stages of pregnancy, as the uterus continues to grow, the pelvis is continuously pressurized for a longer period of time, which makes it easy for pelvic deformation to occur. The center of gravity of a pregnant woman in late pregnancy shifts forward, and the center of gravity of the body is not transmitted to the femur through the sacroiliac joints. At this time, in order to maintain the balance of the body, part of the force will be transmitted to the pelvic position, which will result in anterior pelvic tilt. Anterior pelvic tilt can cause asymmetry between the left and right sides of the pelvis, and the phenomenon of one high and one low pelvis after delivery can occur. It needs to be corrected by pelvic floor muscle rehabilitation training and pelvic correction training within 6 months after delivery, and most mothers can return to normal. In addition, excessive weight-bearing in late pregnancy, resulting in hip joint lesions, postpartum pelvis may also be high and low. This situation is relatively serious, often accompanied by hip pain and discomfort, and even affect walking. Imaging tests are needed to clarify the diagnosis and active treatment.