Late pregnancy <37 weeks of pregnancy cervical canal length of 28mm, no abdominal pain is generally not dangerous, but if there are paroxysmal abdominal pain may have the risk of preterm labor; pregnancy ≥ 37 weeks is not dangerous. Late pregnancy refers to pregnancy ≥ 28 weeks later, before full-term when the ultrasound examination only suggests that the length of the cervical canal 28mm, and pregnant women do not have symptoms of abdominal pain is generally not dangerous, need to pay attention to reduce the activities, appropriate rest. However, if the cervical canal is open and there is paroxysmal abdominal pain, there may be a risk of preterm delivery and hospitalization is required for fetal preservation. When the pregnancy week ≥ 37 weeks has been full-term and the fetus has matured, at this time the cervical canal length of 28mm is not dangerous, even if the labor is approaching, just let nature take its course and observe the progress of labor. In late pregnancy, we should pay attention to appropriate rest, increase nutrition to meet the needs of fetal growth and development, for those with comorbidities, such as gestational diabetes mellitus, gestational hypertension and other pathological diseases, we should strictly follow the doctor's instructions on time for labor and delivery examination, and closely monitor the changes in blood glucose, blood pressure. When abdominal pain and other abnormalities occur, it is necessary to go to the hospital in a timely manner.