Dislocation of acromioclavicular joint is a common injury of shoulder,which occurs often in young and middle-aged people,accounting for 4％-6％ of joint dislocation and 12％ of shoulder injury.The main injury mechanism is the adduction of upper limbs due to the acromioclavicular ligament and the sacral ligament injury caused by the strong direct violence against the shoulder.Another mechanism is the acromioclavicular ligament injuries caused by the indirect violence against the hand first when the upper limbs are abducted.The symptoms include local pain of the affected shoulder joint and confined motion of the affected limbs in abduction and uplifting.In the X-ray image,the upward move of the distal clavicle and the increased coracoclavicular distance can be observed.With the in-depth study of the anatomical characteristics of acromioclavicular joint dislocation and the biomechanical characteristics of the surrounding ligaments,a great variety of treatment methods have emerged,showing various therapeutic effects.In recent years,advances in materials science and minimally invasive techniques have provided more options for the treatment of acromioclavicular joint dislocation,with the trend towards minimally invasive surgery and anatomical reconstruction.This article reviews the anatomical characteristics of acromioclavicular joint,classification of dislocation,diagnosis and selection of surgical treatment,in order to provide reference for clinical treatment.