Objective To study the clinical effects of the clavicular hook plate in treatment of acromioclavicular joint dislocation. Methods 37 cases with the acromioclavicular joint dislocation surgery were carried out.Results After internal fixation for 6 to 12 months, remove the plate, and then follow up for 3 to 18 months. According to the grading standards in shoulder joint function by Karlsson ,31 cases of A grade,4 cases of B grade,and 2 cases of C grade,the excellent rate is 94.6%. Conclusions Internal fixation with clavicular hook plate is a good method in the treatment of acromioclavicular joint dislocation.