Abstract: Objective: To measure the tensile strength of the normal medial patellofemoral ligament（MPFL） and to evaluate the biomechanics in MPFL reconstruction using the hamstring tendon graft on the patella. Methods: Fresh cadaver knees were prepared by isolating the patella,with the MPFL left as its attachment to the femoral.The MPFL was reconstructed with two different methods.The tensile strength and the displacement to peak force of the MPFL were measured. Results: The tensile strength of four-suture was stronger than that of MPFL and suture-anchor. Conclusion: The four-suture method can be used clinical practice due to its tensile strength.Four-suture that needs no specific implants is more economical,convenient and efficient than suture-anchor.