The curve pattern response of idiopathic scoliosis during the treatment of Milwaukee Brace were discussed.Three types of the curve pattern responese, from single major curve to double structural curves, from single major curve to single major curve and from double major curves to double major curves, were mainly seen.Im 24 cases, initialy diagnosed single major curve, 11 cases were considered to be double structural curves in the final assesment and in the cases with thoracic major curve, the lumbar compensatory curve was apt to become into the structural one.Correction rate, Age-at-onset and Development of iliac apophysis at the start of the treatment were discussed.