The purpose of this study was to determine the relationship between biomechanical parameters of lower limb and Velocity of arm strike during punch Gyaku Zuki. Five male of high level Karate players were participated in this study (age: 25± 1.58 years; Age Training: 19.60 ± 1.14 years; body mass: 75.40 ± .55 kg; height: 177.40 ± 3.64 cm). Peak ground reaction force and time of peak ground reaction force for front leg were measured using force plate (Bertec 4060-10). Kinematical analysis of the lower limb and the velocity of arm strike were measured using high-speed camera 125 frames/second. The performance was analyzed by Video Point 2.5 motion analysis software. The results showed that there's an inverse relationship between parameters of velocity resultant center gravity of arm strike with the time of front leg touch down on force plate was -.491*and with peak impact ground reaction force of front leg was -.744**. The positive relationship between parameters of velocity resultant center gravity of arm strike with peak impact ground reaction force time of front leg was .601** The rationale which was found in this study is that the karate players can perform punch Gyaku Zuki skill of the highest velocity of the arm strike, by moving the front leg with minimum time and impact ground reaction force. And this relationship is of major importance since it allows coaches and even players to identify the most appropriate to correct technique performance punch Gyaku Zuki skill.