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The main aim of this study was to examine the absolute and relative of some commonly used strength imbalance indices such as concentric hamstring-to-concentric quadriceps ratio(Hcon/Qcon : conventional H/Q ratio), eccentric hamstring-to-concentric quadriceps (Hecc/Qcon : functional H/Q ratio). An additional aim was to examine the reliability of the peak torque, total work/body weight(%WT), average power(AP) of the conventional H/Q ratio and functional H/Q ratio measured using the isokinetic dynamometer(Biodex system4, U.S.A). Twenty-three physical active healthy subject(mean±SD, age 22.2±2.1 years, height 173.6±8.7㎝, weight 71.5±9.8, percent fat 19.5±5.9, BMI 23.6±1.7kg/m2) were tested 60°/S, 180°/S concentric contraction and eccentric contration. Peak torque(PT) and percent total work(%TW) were significantly different among conventional and functional H/Q ratio, but average power were not significantly different among conventional and functional H/Q ratio. The evaluation of knee joint function by use of isokinetic dynamometer should comprise data on functional and conventional hamstring:quadriceps ratios as well as data on absolute muscle strength. The agonist-antagonist strength relationship strength for knee extension may better described by the more %total work funtional ratios of eccentric hamstring to concentric quadriceps.