There has been much controversy about ways of operation of the traumatic dislocation of acromio-clavicular joint. Our studies revealed that internal fixation of acromio-clavicular joint using kuntsher nail with steel wire is superior to traditional internal fixation of crossing kuntsher nail. We treated 27 cases in this way who were followed-up for 22 months to 9 years. Excellent result was achieved in 25 cases (92.6%) and good in 2 (7.4%). No complication was observed. We conclude that the way of internal fixation using kuntsher nail with steel wire to treat the dislocation of acromio-clavicular joint has following advantages: (1) simple operation; (2) minimum injury to articular surface; (3) stable internal fixation; and (4) no side effect.