Discuss technical and efficacy of AO mini titanium metal plate and nail treatment metacarpal fracture. Methods: 21 patients with 22 metacarpal fracture, titanium bar supplier using a special AO mini titanium plate internal fixation nail treatment, Results: Patients were followed up for 3-6 months, fracture healing rate of 100%, hurt palm knuckles and interphalangeal joints flexion function returned to normal. Conclusion: For the rehabilitation of post-traumatic higher requirements metacarpal fracture, improve titanium alloy wire the traditional treatment techniques, the use of features of AO mini titanium plate and nail row solid internal fixation, combined with early postoperative functional exercise, obtained satisfactory therapeutic results; metacarpal fracture is an ideal treatment.