In July 1999, we designed a Nitinol device named acetabular tridimensional memorial-fixation system (ATMS), which has the character of memorial compression, anatomical and 3-D fixation. 20 cases of acetabular fractures were treated with this system by December, 2000, Follow-up results showed that anatomical reduction were seen in all cases, including comminuted acetabular fractures. 1.6 months after operation, the fractures healed osseously, except for one case complicated myositis ossification, all the cases were achieved good function.