Objective To study the surgical approach and the clinical outcome of arthroscopic transtibial double-bundle and double-tunnel PCL reconstruction using calcaneal-tendon allograft.of study Clinical study. Methods The study group consisted of ten cases, who suffered from knee instability resulted by PCL rupture. On these cases arthroscopic PCL reconstructions using calcanealtendon allograft only by anterior approach were performed between March,2002 and April,2003. Firstly,we fixed the square bone block with a length of 10mm, which connected with a band of calcaneal tendon with a diameter of 12mm,into the tibial tunnel. Then, the tendon was divided into two parts in proportion as 3.2(7mm:5mm),which were fixed into the anterolateral (AL) and posteromedial (PM) tunnels in medial femoral condyle respectively. Fixing knees with plaster slabs or braces for 4 weeks after operation. The periods of follow-up were 12 to 48 months (average,32months),and the outcome was evaluated by Lachman s test, posterior drawer test(PDT),and Lysholm scorses. Results: Knee instability was present in no case after operation. Stability in coronary axis had recovered. Before operation,Lachman test and PDT were both positive in every case, but became negative after operation. Extension and flexion of knee joints became normal. Lysholm scores rose from 58(pre) to 93(post) .Joint function of nine cases reached excellence level, one case reached good level, total rate of excellence and good was 100％.Clinical observations suggested that immunological rejection was less(only one got a mild fever),meanwhile, no surgical complication had happened. During 48 months, any ligament looseness was not obseved. Satisfactory clinical outcome was achieved in whole group. Conclusions Double-bundle and double-tunnel PCL reconstruction using calcaneal-tendon allograft is a good means , which not only avoids injuring donor area, but also accords with the anatomical structure of PCL. The short-term outcome has been proved, but long-term outcome needs more observations.