Bishop score is to judge the cervical maturity and estimate the success rate of trial of labor, out of 13 points, >9 points are successful trial of labor, 7-9 points are 80% success rate, 4-6 points are 50% success rate, ≤3 points are failure. Clinically, it is generally based on the score <6 if the trial of labor should first promote cervical maturation treatment, and its scoring criteria are based on the following five indicators: 1. The opening of the uterus is large. It is 0 points if the uterus is not opened, 1-2cm is 1 point, 3-4cm is 2 points, and 5cm or more is 3 points. 2, the cervical canal regression, 0-30% is 0 points, 40%-50% is 1 point, 60%-70% is 2 points, and ≥80% is 3 points. 3, the position of the previa, that is, the relationship between the fetal head and the level of the sciatic spine, -3 is 0 points, -2 is 1 point, -1 to 0 is 2 points 4, the hardness of the cervical canal, hard is 0, moderate is 1, soft is 2. 5, the position of the uterine opening, toward the back is 0, center is 1, toward the front is 2.