Abstract: Objective: To investigate the magnetic resonance imaging(MRI) features of placenta implantation.Methods: The MRI findings of placenta implantation in 7 cases were retrospectively analyzed,which included 4 cases treated with prenatally plain scan and 3 cases treated with postpartum plain and enhanced scan.Results: The boundary of placenta and myometrium in local region of 7 cases were unclear,which included 4 cases in the anterior wall of uterus,2 cases in the fundus of uterus and 1 case in the anterior wall and fundus of uterus.Multifocal low signal bands in placenta of 6 cases and flow void signals of multiple dilated tortuous vasculature in placenta of 5 cases were shown on T2-weighted images.Two cases with placenta previa were detected by prenatal examination,3 cases with strengthening placenta tissue were found by postpartum enhanced scan.Conclusions: MRI examination is the best way in diagnosing placenta implantation at the little value of Ultrasound examination.The unclear boundary of placenta and myometrium,placenta invading myometrium,low signal bands and flow void signals of multiple dilated tortuous vasculature hint the placenta implantation.