Emergency cervical cerclage is an emergent surgery for the treatment of asymptomatic cervical dilation and/or amniotic protrusion in the second trimester and is widely carried out domestically and /or abroad. However，this surgery has certain technical difficulties and may be accompanied by complications such as premature rupture of membranes，chorioamnionitis，and cervical laceration. Obstetricians may have confusion about how to easily and effectively retract the protruded fetal membranes. They often face difficulties with evaluating the benefits and risks of the surgery and with accurately predicting the pregnancy outcomes. This article reviews the clinical evidence and key surgical points of emergency cervical cerclage，in order to provide reference for obstetricians to perform the surgery.