Abstract: Cervical cerclage is the only effective treatment for cervical incompetence. Its incidence of complications is low and less reported. Its severe complication is very rare. The most common complications include premature rupture of membranes, chorioamnionitis, endometritis, perioperative bleeding, cervical laceration, cerclage suture or cerclage tape shift, etc. Rare complications is fistula between cervical and bladder or ureter. The complications of transvaginal cervical cerclage are higher than transabdominal cervical cerclage. The incidence of complications is difference due to the timing of cervical cerclage and its indications. Complications are always increasing along with the increase of gestational age and the expansion of the cervix. The risk of complications can increase when the membranes ruptured or cervical dilated. So must be master the indications and contraindications strictly, as well as choose the suitable operation time to perform cervical cerclage. It have proved that the puncture point and position of cerclage tape influence on the pregnant outcome directly. When the cervical cerclage tape is near the cervical inner, the pregnant outcome is better. In general activity restriction and bed rest is needed after cervical cerclage. Progesterone and prophylactic tocolytics is used that if the uterus is higher sensitivity. Antibiotics should be used when a history or signs of infection exist. Screening and treatment of vaginal infections, close monitoring the conditions of mother and fetus, paying attention to the possible complications of cervical cerclage is helpful to increase the successful rate of surgery. After laparotomic or laparoscopic cerclage the delivery mode is cesarean section. If there are signs of labour, cesarean section should be done immediately to avoid cervical laceration or uterine rupture.