All reports on brachial plexus injury which were presented on the 9th Inteational Hand Surgery Meeting (2004),the 5th Asia-Pacific Area Hand Surgery Meeting (2005),the 10th Europe Hand Surgery Meeting (2005) and 49th Japan Hand Surgery Meeting (2006),were collected and reviewed.We also went through our own research on brachial plexus injury,and a cumulative review of all these reports and researches was made.