To discuss the effection of temporary fixation of cortical margin kirschner wires in the treatment of femur intertrochanteric with ipsilateral femoral neck fracture. Method A retrospective review was made on 11 patients with ipsilateral intertrochanteric and femoral neck fracture treated with proximal femoral intramedullary nail (Intertan system) from July 2016 to June 2018. After satisfactory reduction of two fractures, several kirschner wires were fixed at the cortical margin of proximal femur provisionally to make the reduction stable, the proximal femoral intramedullary nail was then inserted. Wound healing and hip soft tissue condition were observed 2 weeks after surgery，fracture healing was evaluated by hip X-ray 1～3、6、12 months after surgery and hip function was evaluated according to the Harris hip function score at last follow-up. Result 11 patients were followed up for 12 to 18 months (mean, 14.9 months). The would healed well after operation，no complications happened such as infection and neurovascular injury. The fracture healing time was 16 to 28 weeks (mean, 22.4 weeks). No reduction loss, no loosening or break of internal fixation were observed during the follow-up of 3 and 6 months. No osteoarthritis or femoral head necrosis occurred at the last follow-up, the Harris scoring ranged from 73 to 94 points (mean, 85.9 points). 4 patients were rated excellent and 5 good , with the excellent-good rate of 81%. Conclusion Proximal femoral intramedullary nail is an effective fixation to treat femur intertrochanteric with ipsilateral femoral neck fracture, and the provisional fixation of kirschner wires at the cortical margin of proximal femoral ensure the completion of intramedullary fixation, which is the key method to achieve satisfactory clinical effects