A short cervical canal is more dangerous at 22-24 weeks, when it tends to increase the risk of miscarriage in the middle of pregnancy. A short cervical canal is usually caused by a woman’s congenital dysplasia. If a woman has a short cervical canal, she may have a higher chance of preterm labor or miscarriage during pregnancy. Usually after 16 weeks of pregnancy, patients are advised to visit the obstetrics and gynecology department to complete a vaginal ultrasound to check the length of the cervical canal. Generally, a cervical canal length of 25-30 mm is considered normal. If the length is less than 25 mm, a short cervical canal is usually considered. If the shortened cervical canal can be detected in early pregnancy, cervical cerclage can be considered to help fix the position of the cervix and may prevent the occurrence of preterm labor or miscarriage to some extent. Patients are advised to stay in bed, reduce walking on the floor, pay attention to personal hygiene in daily life, wash the vulva with warm water every day and change underwear regularly.