It was known that the etiologies of slipped capital femoral epiphysis(SCFE) were trauma, hormonal or endocrine disorder, genetic factor, radiation, renal osteodystrophy which render the epiphyseal plate susceptible to displacement. We report the case of a 6 year old boy who had SCFE following malunion of the ipsilateral subtrochanteric fracture. The alteration of shear force on epiphyseal plate can be one of the contributing factors in SCFE.