The speed of cervical finger opening is related to the texture of the cervix, its length, and its position anterior to the middle and posterior. If the cervix is soft and short, the opening of the uterus will be faster once there are regular contractions. The speed of the opening of the uterus is also related to the height of the fetal head previa and the intensity of contractions, the lower the fetal head previa, the faster the birth. Uncoordinated contractions are slow to open and even stagnant, which are ineffective contractions and can easily cause intrauterine distress. Coordinated contractions are weak, with long intervals and slow finger opening. Contractions of medium intensity, with an interval of 3-4 minutes, lasting 40-50 seconds, and fast finger opening are the most desirable contractions. Contractions that are too strong, 1-2 minutes apart, lasting 50-60 seconds, with fast finger opening, are painful for the mother and can easily cause emergency delivery, postpartum hemorrhage, birth canal laceration and intracranial hemorrhage of the fetus.