Abstract: [Objective] Arthroscopic treatment of patients who need posterior cruciate ligament reconstruction through posterior-posterior triangulation technology, and analysis of its safety and effectiveness. [Methods] A retrospective analysis of patients with posterior cruciate ligament reconstruction admitted to our hospital was performed. Patients in the study group were treated with posterior triangulation technique (32 cases), and patients in the control group were treated with anterior and posterior approach surgery (28 cases). Observation indicators include perioperative conditions, follow-up indicators and imaging evaluation. [Results] There was no significant difference in the time from injury to operation and hospital stay between the two groups of patients (P>0.05); the operation time of the study group was significantly shorter than that of the control group (P<0.05); the difference in postoperative complications between the two groups was No statistical significance (P>0.05); There was no significant difference in the positive rate of drawer test between the two groups of patients (P>0.05); After the operation, the flexion and extension of the affected knee and the movement of the tibia at 30° flexion were compared between the two groups. There was no statistically significant difference in tibia posterior movement when knee flexion at 90° (P>0.05); the VAS score, Lysholm score and IKDC score of the two groups of patients were significantly improved compared to before operation, and the differences were statistically different (P<0.05) There was no significant difference in the VAS score between the two groups (P>0.05); the Lysholm score and IKDC score of the study group were significantly higher than those of the control group (P<0.05). [Conclusion] The use of posterior triangulation technology for arthroscopic reconstruction of the posterior cruciate ligament can better expose the surgical field, reduce operation damage, save operation time, and retain the stump of the posterior cruciate ligament and the plate femoral ligament, and promote the function of the knee joint recover.