Femur neck fractures in children are relatively rare by comparison with the incidence in adults and can occur by high-energy trauma. The common complications of femoral neck fracture are avascuar necrosis, coxa vara, premature physeal closure and nonunion. The femoral neck fracture by traffic accident in 7-years-old girl was reduced closely and fixed internally. After 1 year later, varus deformity, slipped capital femoral epiphysis and avascular necrosis occurred. Valgus osteotomy and epiphysiodesis were done. There are many series of complications after femoral neck fractures in children, but the case followed by varus deformity, slipped capital femoral epiphysis and avascular necrosis as complications is rare. We report the clinical and radiologic finding of this case with pertinent literature.