We present here a case of vasa previa with a special parachute placenta. During two times of ultrasonic scanning, there was dispute for the existence of vasa previa. Then the patient was referred to magnetic resonance imaging(MRI) scanning, and a parachute type of placenta and a previa vessel were identified. The patient subsequently underwent an elective cesarean section after 34 weeks of gestation, giving birth to a healthy child with an uneventful post-partum course. The cesarean section avoided laceration of the vasa previa which would probably bring fetal life threatening complication due to acute fetal blood loss. The identification and exclusion of vasa previa are essential to ensure appropriate and timely treatment. If there’s contradictory ultrasonography results, MRI may offer some assistance in diagnosis.