Fetal magnetic resonance imaging has raised up scholars’ interest since first incepted in 1983. It has been proved to be more accurate when estimating fetal weight comparing to ultrasound. The purpose of this review was to assess the efficiency of MRI on fetal body weight estimationas well as its ability of diagnosing congenital malformation. The papers were researched from three online databases, PubMed, ScienceDirect, Web of Science, by using terms “MRI,” “fetal weight,” and “ultrasound.” Inclusion criteria were demonstrated as follows:(i MRI, (ii ultrasound, (iii fetal weight, (iv research article. Up to now, with the improvement of magnetic resonance technique, the time to perform MRI is shorten, however, higher cost, lack of equipment and radiology expertise still exist, which limit... its wide use in clinical. Nonetheless,MRI shows more great efficiency in fetal weight estimation and diagnosing congenital malformation compared to US.