Abstract： Objective To analyze the magnetic resonance imaging(MRI) characteristics of hema-tospermia seminal vesiculitis(HSV) and investigate the diagnostic value of MRI in HSV. Methods From April 2015 to April 2018,13 cases of male patients with hematospermia who were admitted were selected. They were aged(28. 4 ± 6. 7) years old,ranging from 20 to 82 years old. Scan sequences were divided into turbo spin echo(TSE) T2WI cross-sectional scanning,TSE T2WI sequence with fat suppression technique scanning( sagittal and coronal and transverse section),TSE T1WI sequence cross-sectional scanning,and volume interpolated body examination(VIBE) sequence(sagittal and coronal and transverse section),the seminal vesicle gland size and signal changes of the patients were observed and analyzed. Results Of the 13 cases,7 cases involved bilateral seminal vesicles,and 6 cases involved unilateral seminal vesicles. Twen-ty seminal vesicles were enlarged,and six were not. All the 13 patients had decreased follicular structure in T2WI image,and increased signal in T1WI image. There were no complications in 2 cases. Four cases were complicated with prostatic hyperplasia. One case was complicated with prostate Mullerian duct cyst. Two ca-ses of mild enhancement after enhancement( one of them showed prostate cancer combined with right pe-ripheral zone and left seminal vesicle hemorrhage after radical resection of prostate cancer under laparo- scope,bilateral seminal vesicle gland symmetry increased. The pathology of the other case after cystoscope showed mild atypical hyperplasia of urinary tract epithelium with bladder inflammatory polyps and focal re-gion,and small seminal vesicles on both sides. Four cases were followed up for reexamination after treatment (1 case had no obvious change after 1 week. Reexamination at 3 months after treatment in 2 cases and 6 months after treatment in 1 case showed that the seminal vesicle signal decreased on T1WI and was close to normal. Conclusion MRI is an important method for diagnostic analysis in the hematospermia seminal ve-siculitis. High signal intensity on T1WI images is more characteristic. On T2WI images and fat supressions, follicular structure reduced with the duct wall of seminal vesicles were unclear which helps better to the di-agnostic analysis of MRI.