Preterm delivery occurs approximately at 8-10% of all deliveries, but it is associated with 75% of perinatal mortality, morbidities including long term sequelae such as cerebral palsy and developmental delay. Recent researches have resulted in improvements in prediction and prevention of preterm delivery. Measurement of cervical length using transvaginal ultrasound is one of the methods found to be useful for prediction of preterm delivery. Cervical length measured during midtrimester is inversely related to the risk of preterm delivery in various study populations. However, due to different clinical settings and different management protocols, optimal management based on cervical length measurement is still controversial. This article reviews major issues on management options for asymptomatic women with short cervical length.