The aim of emergency cervical cerclage （ECC） is to prolong gestational weeks to avoid miscarriage in the third trimester or preterm delivery.  After exclusion of infection and active uterus contractions，for those women at 16-23+6 weeks，no more than 27+6 weeks，with singleton cervical ≥1cm，and/or membrane prolapse into vaginal intact membrane；twins cervical ≥1cm，ECC might be a safe and effective optiont. The key point of ECC procedure and the importance of standard management of the operation in ensuring clinical safety are also introduced.