Under normal circumstances narrow pelvis is the shape of male pelvis, because men are not very demanding for narrow pelvis or not, while women also have the possibility of narrow pelvis. Because of congenital developmental abnormalities in women can lead to a narrow pelvis. Once a woman has a narrow pelvis, if the narrowing is not very serious, she can practice the strength of the pelvic floor muscles and the strength of the ligaments around the pelvis, and try to have a trial of labor if the fetal head diameter is small at the time of delivery. However, if the stenosis is severe, it usually affects the woman’s delivery and the fetus cannot be delivered from the bony birth canal. Therefore, pelvic stenosis usually occurs in men with a narrow pelvis or in women with developmental abnormalities that lead to the onset of a narrow pelvis, which in turn affects the physiological function of the woman.