Cerebroplacental ratio（CPR），calculated as a simple ratio of middle cerebral artery pulsatility index and umbilical artery pulsatility index，is considered as a sensitive indicator for fetal distress and has received attention from obstetricians and sonographers in recent years. The aim of this article is to review the key evidence regarding the value of CPR in the assessment of fetal growth and in the prediction of adverse perinatal outcomes.