Bone-patellar tendon-bone graft has been an attractive option for single-bundle anterior cruciate ligament reconstruction in clinical practice. However, the graft-tunnel mismatch in the proximal part of the tibial tunnel and the ultimate strength after postoperative ligamentization process have been potential problems for the traditional 10-mm wide graft. We modified the traditional bone-patellar tendon-bone allograft to make it double-layer, as an ideal substitute graft for single-bundle anterior cruciate ligament reconstruction with better graft-tunnel match and higher initial graft strength.