The puropose of this study was to investigate the movement-fitness according to the surface changing of lower limb. The experimental items were divided into the lower limb movements (5) and body-shapes (7). This study was done by the expansion and contraction rate consideration of length, girth area. Also, the lower half of body shape-change on the movements and body-shapes by flat shell was done simultaneously. The summarized findings resulted from experiments and investigation are suggested as follows; First, when commpared the expansion and contraction rate of the length and girth items, the expansion rate of the back crotch length (14∼20%), hip girth (10∼21%) and knee girth (6.2∼18.5%) in rabbit leap movement was the most notable among all variables considered in this experimentation. On the other hand, the front croth length (-22∼-52%) contrated remarkably. And big-thigh type was the most notable on the body-shape comparision. Second, in comparision of the expansion and contraction rate of the area on the blocks, the expansion of the hip (50-200%) and knee (51-74%) block was the most remarkable. Especially, in the sit on knees movement of the hip-down type expanded 209.4%. Third, in comparision of the lower half of body shape-change, on the movements and body shapes by the flat shell, under the influence of knee-joint and hip-joint the shape-changs of the hip and knee block was the most notable. But the shape-change of the waist, abdomen, calf, and ankle was feeble. According to these investigation the high expansion rate of the back crotch length, hip girth and knee girth is considered with the factors for the functional slacks pattern making.