Difficult labor, also known as abnormal labor, is influenced by the force of delivery, the birth canal, the fetus, and the mental and psychological factors of the mother. The above factors affect each other, thus leading to the occurrence of difficult labor. Specifically as follows: 1. Abnormal labor force: weak uterine contractions can lead to prolonged labor or stagnant labor. Excessive uterine contraction can lead to emergency labor and labor complications; 2, abnormal birth canal: mainly refers to the abnormal bone birth canal, which can lead to abnormal fetal position and abnormal progress of labor; 3, fetal anomalies: abnormal fetal position can lead to uterine contraction weakness, staghorn labor and so on. Abnormal fetal size can lead to prolonged labor, stagflation, labor complications, etc.; 4. Maternal mental and psychological factors: some mothers have a certain fear of natural childbirth.