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Background: This study was to examine the effect of applying leg exercise using visual informations on improving stroke patient's muscle power, balance and gait. Methods: The subjects of this study were hemiplegic patients by stroke, 30 patients were picked up, who were agreed with this research and were having hospital care for 8 weeks at RS, RB and HH medical centers. The study group was 15 and comparison group was 15, totally 30 patients were confirmed. leg exercise using visual informations was applied to study group, leg exercise without visual informations was applied to comparison group. These were proceeded for 8 weeks (5 days a week, 20 minutes a day), change of muscle power, balance and gait was checked to investigate the effect. Electromyography apparatus was used for checking muscle power, K-BBS (Korean version of Berg Balance Scale) and COP (center of pressure) were used for balance, then Functional Gait Assessment (FGA), timed up and go test (TUG) were used for checking the capacity of gait. Results: Vastus lateralis (p=.002), biceps femoris (p=.000), K-BBS (p=.000), COP (p=.007), FGA (p=.002), TUG (p=.009) are significant difference between the two groups. Conclusion: This study showed that visual informations impact change of muscle activity, balance and locomotor ability in stroke patients.