The causes of abnormal labor include the following factors: 1. fetal factors: such as the baby is too heavy; 2. birth canal factors: the pelvic bones are small in diameter, such as flat pelvis, male pelvis, or simian pelvis; soft birth canal abnormalities, such as abnormal development of the cervix or the effects of acquired surgical treatment, so that the cervix is not soft enough to be able to successfully open the cervix; vaginal problems such as the presence of vaginal septum, transverse septum, or longitudinal septum, etc.; 3. labor force factors; 4. mental and psychological factors: because of the nervousness or pain can not eat well, and premature fatigue may lead to the lack of contractions, and the emergence of obstructed labor.