Objective To observe the effect of button plates in treatment of Rockwood Ⅲ and greater acromioclavicular dislocation. Methods From January 2013 to December 2017, 60 Rockwood Ⅲ and greater acromioclavicular dislocation patients in our hospital were randomly divided into observe group(30 cases)and control group (30 cases), the observe group received button plates treatment, the control group received clavicula hook plate treatment. The shoulder function(Constant-Murley)of two groups before and after treatment were compared, and the effect of operation(the good rate of Karlsson), surgical time and intraoperative bleeding of two groups were also compared. Results There were no difference in shoulder function between two groups before treatment(P＞0.05). The indices were increased after treatment(P<0.05), and the indices in the observe group were higher than that of control group(P＜0.05), The good rate of Karlsson index, intraoperative bleeding of observe group were better than that of control group(P＜0.05).The surgical time of observe group were better than that of control group(P＜0.05). Conclusion Button plate's internal fixation nay better improve the shoulder function; it has better therapeutic effect, and smaller trauma to patient.