Abstract: [Objective] To analyze the effect of a modified thin free anterolateral perforator flap for repairing traumatic skin defects of the lower leg. [Methods] A retrospective analysis of 106 patients with traumatic traumatic skin injury admitted to our hospital from February 2017 to March 2020. After admission, we received first-stage debridement and negative pressure drainage treatment, and second-stage free anterior lateral perforator Flap repair. Patients in the modified group received modified thin flap repair (56 cases), and patients in the conventional group received conventional flap repair (50 cases). [Results] The operation time, intraoperative blood loss and hospitalization time of patients in the modified group were significantly lower than those in the conventional group (P<0.05). At the last follow-up, the tissue growth score of the patients in the modified group was significantly better than that of the conventional group, while the pain score was significantly lower than that of the conventional group (P<0.05). The incidence of bleeding, infection, liquefaction, and flap necrosis in the mixed group was significantly lower than that in the conventional group (P<0.05). [Conclusion] The use of modified thin free anterior lateral femoral perforator flaps in patients with traumatic skin defects of the legs has the advantages of safety, high efficiency, and fewer adverse reactions. It is satisfactory in terms of restoring tissue growth ability and improving recovery effects. ; It can also effectively reduce the perioperative index and avoid the impact of surgical trauma on rehabilitation as much as possible.