The success rate of cervical cerclage for cervical insufficiency depends on the indication and timing of the procedure, with prophylactic cervical cerclage having a high success rate and emergency cerclage ligation having a relatively poor success rate. Cervical insufficiency is defined as the inability of the cervix to retain its normal shape and function until the full term of pregnancy, which can lead to recurrent late miscarriages or preterm deliveries. Cervical cerclage is a surgical procedure in which the cervix is surgically closed with circular sutures to enhance cervical support and preserve the pregnancy. Prophylactic cervical cerclage is performed at 13-14 weeks of the next pregnancy for those with a history of 1 or more unexplained late miscarriages or preterm deliveries in pregnancy. Ultrasound follow-up of cervical length is also available and cervical cerclage is recommended if cervical length less than 25 mm occurs before 24 weeks of gestation. It has a high success rate and is effective in reducing preterm labor, neonatal morbidity and mortality. Emergency cervical cerclage is also feasible if progressive dilatation of the cervix, absence of contractions, and absence of contraindications are detected at the time of examination, but too short a cervix or a fetal sac located in the cervical canal will reduce the success rate of the procedure. Patients with cervical insufficiency are advised to seek timely medical treatment and choose the appropriate time and method of surgery to improve the success rate of fetal preservation and avoid recurrence of miscarriage and preterm labor.