Abstract:[Objective] To introduce the surgical technique and preliminary clinical results of arthroscopic osseous sulcus deepening and tendon sheath tightening for chronic peroneal tendon slipping. [Methods] Two patients underwent abovementioned surgery for chronic peroneal tendon slippage. As the posteromedial, posterolateral and posterolateral lower portals were established, the hyperplastic synovial tissue was debrided to reveal the peroneal tendon sheath and osseous sulcus. Under the direct vision of the arthroscope, the belly of peroneal brave extended to the distal end were removed, the osseous sulcus was deepened with a bur, and the peroneal tendon sheath were tightened with supra-peroneal retinaculum. [Results] Both the patients were successfully operated on. The ankle joint function was significantly improved after operation, with AOFAS score of 92 and 94, while the pain VAS score of 0, and the physical activity completely restored, whereas tendon slip did not recur. [Conclusion] The arthroscopic osseous sulcus deepening and tendon sheath tightening is safe, minimally invasive, low complication risk, and archives good outcome for chronic peroneal tendon slipping.