Objective To explore a new method for repairing multiple knee ligament injuries with allogenic achilles tendon. Methods Injuried anterior and posterior cruciate ligament(APCL) in 25 patients with multiple knee ligament injuries was reconstructed under arthroscopy with the bone- patellar tendon -bone which was treated with deep hypothermia and ? radiation. At the same time, injuried medial collateral ligament (MCL) or lateral tissue was repaired. Results After the disappearance of edema and inflammation in the injuried knee joints, the allogenic bone-patellar tendon-bone transplant was performed under arthroscopy. Menisci were sutured in 2 cases, and were resected or partially resected in 15 cases. All patients were followed up for more than 12 months. According to the Lysholm score method of knee function,the average score of preoperation and postoperation was 36 and 85, respectively. The satisfactory rate was 83%. The objective examination showed anterior drawer test(ADT) positive in 21 cases preoperatively, and 2 postoperatively. Lachman test was positive in 22 cases preoperatively, and 2 postoperatively. 3 patients had tolerable pain in knee, and 5 had the limitation of knee activity (5～20?). Conclusion The injury and complication caused by the autograft can be avoided by using allogenic bone- patellar tendon -bone to repair multiple knee ligament injuries. After systemic rehabilitation, the function of the knee joints can be restored reliably.