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The purpose of this study was to investigate the effect of Foot Orthotics on muscular function of knee and lumbar during exercise rehabilitation in adolescent boys. 25 subjects were divided in to control(n=8), exercise(n=8) and exercise included Foot Orthotics(n=9) groups. The exercise and exercise included Foot Orthotics groups were pes planus or pes cavus and/or inversion/eversion(≥±2°) of calcaneus. There were two test periods; pre & after 12wks. In both tests, isokinetic peak torque, mean power and total work were measured using by biodex 3.10 system. At the results, peak torque, mean power and total work in extension of knee joint had a significant difference between pre and after 12wks in two group (exercise group, exercise + orthotics group). Also mean power in extension of lumbar had a significant difference between pre and after 12wks in exercise group. In conclusion, these results mean that Foot Orthotics in exercise rehabilitation have effects on growth of muscular function. Therefore, when abnormal foot arch and calcaneus angle was corrected by Foot Orthotics during exercise rehabilitation, these would carry out beneficial effects for lower limb muscle on activity.