Abstract: [Objective] To introduce the surgical technique and preliminary clinical results of modified minimally invasive technique for repair of acute closed Achilles tendon rupture. [Methods] From January 2018 to January 2020, 35 patients with acute closed Achilles tendon rupture were repaired with modified minimally invasive technique. During the operation, the improved minimally invasive instruments were used to grab the broken Achilles tendon and the pull suture technique was used to effectively suture the broken Achilles tendon of long ponytail shape. [Results] The operation time was (33.1±3.5) min, the incision length was (2.3±0.4) cm, and the suture removal time was (12.5±0.5) d. According to Amer-Lindholm criterion 12 months after operation, 29 cases were excellent, 6 cases were good, the rate of excellent and good was 100%. AOFAS ankle-hindfoot score was 85～100 points [(92.6±2.7) points], of which 31 cases were excellent and 4 cases were good, the excellent and good rate was 100%. At the end of follow-up, no sural nerve injury, deep vein thrombosis, suture rejection, and Achilles tendon re-rupture occurred. The range of motion of dorsiflexion of affected ankle increased from 18°±2.26° (72.11% of healthy ankle) to 25°±2.33° (96.23% of healthy ankle) (t=11.691, P<0.001). Plantar-flexion range of motion increased from 9°±1.94° (29.17% of healthy ankle) to 43°±2.79° (95.68% of healthy ankle) (t=60.164, P<0.001). [Conclusion] The modified minimally invasive technique for repairing acute closed Achilles tendon rupture has the advantages of small incision, fewer complications, good functional recovery and low treatment cost, which is worthy of recognition and promotion.