Objective To explore the prospective application of cold melting technique in knee arthroscopy and surgical technique. Methods Arthroscopic surgery was performed on 20 patients with different knee diseases using ArthroCare 2000 vaporizer. The arthroscopic diagnosed diseases were: meniscal tear in 6 cases, articular cartilage degeneration of the femoral condyle in 6 cases, patellar subluxation in 5 cases, synovial proliferative inflammation in 2 cases, and partial injury of the anterior cruciate ligament in 1 case. Knee arthroscopic partial meniscectomy, repair of the damaged cartilage surface and ligament, partial synovial resection and release of the lateral patellar support band were performed by the vaporizer. The knee joint did not require pressure bandaging after surgery, and the floating patella test was performed on the operated knee joint at 24, 48 and 72 h after surgery, and all were negative. CPM exercise was performed 24 h after surgery, and there was no significant knee pain. The patient had good self-perceived symptoms. The articular and meniscal cartilage treatment surfaces were observed microscopically to be smooth and free of bleeding. Conclusion The ArthroCare2000 vaporizer is easy to operate, precise in treatment, minimizes adjacent tissue damage when removing diseased tissue, and has hemostatic function, which is conducive to early recovery.