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The purpose of this study was to estimate Leg Strength and Flexibility, Balance, Gait by aging. In a population-based sample of female elderly aged 65-75(n = 152), leg strength was measured in two muscle groups (knee extensor, knee flexor) of both legs using an isokinetic dynamometer. A leg strength score was calculated as the sum of the four strength measurements in the both legs. Sit & reach, Balance(One leg with eyes opened and timed upandgo), gait were measured. Subjects were separated into four groups in the first, second, third, or fourth quartiles of using Leg strenrth score: Q1(n = 36), Q2(n = 40), Q3(n = 40), Q4(n = 36). All data were analyzed by one-way ANOVA and Pearson Correlation of SPSS. In the whole subjects group, Leg strength score was increased and related to Sit& reach and One leg with eyes opened and timed up-and go(r=.40, .37, -.35) and significant correlation coefficients between Leg strenrth score and Cadence, Stance Time, Swing Time, Double Supp. Time, Velocity, Step Length, Stride Length, Step Extremity, HH Base Support(r = .44, -.21, -.45, -.33, .49, .27, .24, .47, .25). In the subgroup, Sit & reach, Balance and gait parameters were significantly differences between group. Sit & reach, Balance, gait parameters were significantly higher in the Q3, 4 group(p < .001). In conclusion, strength exercise of Leg muscle is effective on improvement Sit & reach, Balance and gait in the korean elderly women.