In oder to make the bone tunnel in optimal position, effective and firm fixation, early functional recov- ery and minimally operative injury we reported a new technique in reconstructive anterior cruciate ligament(ACL)using patellar tendon autograft fixed with interference screw. With the assistance of arthroscopy 74 patients with ACL rupture were treated between October 1997 and April 1999. The clinical results showed that the operative injury was minimal, fixed bone grafts were accurate and the reconstructed ACL was isometricity. The reconstructed ligament could be fixed biologically and firmly because of used patellor tendon autograft with bone grafts at two end. Clinical experience of ar- throscopic - assisted ACL reconstruction was summarized.