Objective To improve imaging diagnosis of aneurysmal bone cyst at rare parts bone. Methods 29 cases with aneurysmal bone cyst confirmed by surgery and pathology were analyzed retrospectively. Of the 29 cases,9 cases occurred in irregular bone,5 cases of occipital,2 case of pubic, 2 case of sacrum.;20 cases occurred in regular bone, 11 case for humerus,9 case for femur. Results The major imaging signs of the 29 cases of aneurysmal bone cyst located at flat bone and irregular bone were：1、Soap bubble-like expensive bone destruction was detected by X-ray in 7 cases, by CT in 18 cases, and by MRI in 19 cases; 2、Bone trabeculae mixed with osseousseptae in the lesion were detected by X-ray in 3 cases, by CT in 7 cases, and by MRI in 3 cases; 3、Local sclerosis of the bony structure adjacent to the lesion was detected by X-ray in 0 cases, by CT in 3 cases, and by MRI in 15 cases; 4、Partial pathologic fractures of bone shells were detected by X-ray in 2 cases; by CT in 5 cases, and by MRI in 1 cases; 5、Fluid-fluid level inside the lesion was detected by CT in 2 cases, by MRI in 20 cases; 6、No periosteal reaction; 7、Soft tissue mass was detected by CT in 0 case, by MRI in 1 case. Conclusion The imaging characteristics of aneurysmal bone cyst at flat bone and irregular bone are similar to that at long-tubular bone, DSCT and MRI can distinctly improve the correct rate of diagnosis.