Objective To investigate the CT and MRI features and pathologic basis of abdominal desmoid-type fibomatoses and improve the understanding of the disease. Methods The images and pathologic results of 17 DF cases proved by sugery and pathology were retrospectively analyzed. Results 21 lesions were foud in 17cases,among which 15 cases were single and 2 cases were multiple. 5 Lesions were located in the abdominal wall and 16 lesions were located under the abdominal wall. 18 lesions displayed fusiform or elliptic and three lesions were irregular shape.The border of 16 lesions were clear,4 lesions were unclear,and One lesion was not clear.5 focuses grew aggressively, 3 of which crossed the muscle clearance,while 16 lesions grew expansicely.17 lesions were found on CT, among which 8 lessions were equal to the density of muscle,and 8 were slightly lower than the density of muscle ,1 was mixed density .Most lesions exhibited gradually moderate or obvious enhancement on post-contrast CT.12/17 were homogeneous, 5/17 were heterogeneous. 4 lesions were foud on MRI, which were homogeneous signals on TIWI and high signals or slightly higher signals on T2WI and Fat suppression. The lesions were uneven significant enhancement,The degree of strengthen was higher than the muscle. 3 cases of lesions foud low band signal in each sequence and without reinforcement on post-contrast MRI. Tumor was composed of fibroblasts and myofibroblasts on pathologically,among which fibrous tissue and collagen tissue were found, accompanied by focal lymphocytic infiltration, myxoid degeneration, hyaline degeneration, hyperplasia of small vessel expansion and bleeding. Conclusion Abdominal DF has some characteristics which reflected its pathological characteristics on CT and MRI, CT and MRI has important significance for its diagnosis.