The contraction weakness is the lack of strength of uterine contraction, which can be divided into primary contraction weakness and secondary contraction weakness. Primary contraction weakness is the lack of strength at the beginning of labor, while secondary contraction weakness is the lack of strength at the beginning of labor, which eventually leads to stagnation of labor progress. Weak contractions can be caused by the following reasons: the fetus is too large, the pelvis is narrow or the fetal position is abnormal, resulting in the fetal previa not being able to compress the cervix and lower uterine segment well enough to trigger contractions reflexively; the uterus is overstretched and the muscle fibers are extremely elongated, such as excessive amniotic fluid, twin fetuses, huge fetuses, resulting in weak contractions; or the uterus itself is abnormal in development, such as unicornuate uterus, bicornuate uterus, combined with uterine fibroids, etc. The excessive nervousness of the mother after delivery, poor food and sleep, premature physical exertion, may also lead to weak contractions; excessive application of sedative and analgesic drugs during labor, may also lead to weak contractions. Once contraction weakness occurs during labor, it may increase the complications for mother and child such as prolonged labor, intrauterine distress and postpartum hemorrhage. Once the contractions are weak, the opening of the uterus is slow, the progress of labor is stalled, and the possibility of vaginal delivery has been examined, the uterus can be promoted by intravenous drip of contraction; if there is no condition for vaginal delivery, it may be necessary to end the delivery by cesarean section; if it occurs in the second stage of labor, the opening of the uterus has been fully opened, and the conditions allow for fetal head suction or forceps to assist delivery, so as to minimize If the second stage of labor is fully opened, fetal head aspiration or forceps can be used to assist delivery if necessary to minimize the complications for mother and child due to weak contractions. Therefore, it is important to have a reasonable diet and nutrition during pregnancy, to control the weight gain, and to keep the fetus within 7 pounds, 6 and a half pounds is the best; after delivery, relax, eat well and rest well, and be in a free position to reduce the occurrence of contraction weakness.