[Objective] To investigate the effect of extended PFNA combined with steel wire binding in the treatment of intertrochanteric subtrochanteric fractures. [Methods] A retrospective analysis was performed on 26 patients with subtrochanteric intertrochanteric disease who were hospitalized in our hospital from February 2018 to June 2020, with AO/OTC classification 31-A2.3 and Seinsheimer classification V-type. proximal femoral nail anti?rotation (PFNA) treatment (unbundled group) and lengthened PFNA combined with wire binding (bundled group) were used in 13 cases, respectively. [Results] The complete weight-bearing time of the strapped group was significantly shorter than that of the unstrapped group, and the VAS score, Harris score, hip extension-flexion ROM, hip endo-external rotation ROM and Harris score at 1 month after the strapped group were all better than those of the unstrapped group, with statistical significance (P<0.05). At the last follow-up, VAS score, Harris score, hip extension-flexion ROM and hip endo-rotation ROM in 2 groups were significantly improved compared with that in this group 1 month and 6 months after surgery, with statistical significance (P<0.05). According to Baumgaertner's criteria, the quality of fracture reduction in the bound group was significantly better than that in the unbound group, and the difference was statistically significant (P<0.05). At the last follow-up, the trunk Angle of neck, the length difference of both femurs and the healing time of image fractures in the bound group were better than those in the unbound group, and the difference was statistically significant (P<0.05). At the last follow-up, the difference of cervical trunk Angle and bilateral femur length in both groups was significantly improved compared with that before surgery, and the difference was statistically significant (P<0.05). The total incision length and intraoperative fluoroscopy times in the bound group were higher than those in the unbound group, and the difference was statistically significant (P<0.05). The healing time of imaging fracture was less than 26 weeks in the bound group, and ≥26 weeks in the unbound group in 4 cases. [Conclusion] In the treatment of intertrochanteric subtrochanteric fracture, the early effect of lengthened PFNA combined with steel wire binding is better than that of PFNA alone.