Objective:To explore new methods of X-ray photography for acromioclavicular dislocation. Methods :20 patients with acromioclavicular dislocation were examined with the position of shoulder frontal-back, internal rotation of the arm and partial inner revolve position respectively; Results:3 patients belonged to typeⅠdislocation, about 15%; 7 patients belonged to type Ⅱdislocation, about 35%; 10 patients belonged to type Ⅲ, about 50%; Conclusion:Patients with acromioclavicular dislocation were mostly diagnosed by the examine with the position of shoulder front-back and internal rotation of the arm, TypeⅢ dislocation could be found in partial inner revolve position.