Objective:To investigate the technique of using elastic stable intramedullary nailing(ESIN) on treatment femoral fractures in children and assess the clinical outcome. Methods:Sixty-eight patients with displaced femoral shaft fractures were treated by ESIN from August 2006 to December 2008. Results:All patients were followed up for average 10 months(6~30 months). The average time of bone healing was 11 weeks(8~12 weeks). All had full range of motion in the near joints and got excellent results without refracture,delayed union or non-union,and rotational deformity. Eight cases had irritation at nail insertion site. Two cases had 1.0~1.5 cm shortening deformity of the femur. Five cases had difficulties associated with removal of nails. Conclusion:The method of ESIN deserves to be a simply and minimally invasive way for the treatment of the femoral fractures in children.