Objective To summarize the magnetic resonance imaging (MRI) features of endometrial stromal sarcomas and improve the diagnosis. Methods MRI findings of 8 cases of my hospital proved by pathology, discuss the imaging (MRI) findings. Results 2 cases were polypoid mass, 1 of these penetrated the wall of uterus and planted the surface of intestines in abdominal and pelvic cavity, 1 case was intramural mass;3cases was diffuse myometrial; 2 cases were huge pelvic mass,which both had a history of leiomyoma of uterus incision,1 of these with mural nodules .7 cases solid mass,2 of 5 with necrosis;1 case solid-cystic mass.On MRI images, the signal intensity of the solid component of mass was often iso-intense on T1-weighted images(T1WI) and little yperintensity on T2-weighted images (T2WI)and much hyperintensity on diffuse images (DWI),which enhanced obviously after the administration of the contrast medium. Conclusion The magnetic resonance imaging (MRI) findings of endometrial stromal sarcoma present 4 pattererns: polypoid mass in ,intramural mass,diffuse myometrial,huge pelvic mass. Most of endometrial stromal sarcomas are solidmass.When finding the imaging of above-menttioned,expecially with infiltrated developing, and the the solid components on diffuse images were much hyperintensity and enhanced obviously, may sugest thediagnosis of uterine endometrial stromal sarcoma.