A kinematic comparison of the performance of Yuraken Uchi's skill with the arms of the Kumite players in the sport of Karate **Dr.Abdulaziz El-Sayed Mohamed El-Sayed Refaei This research aims at "a kinematic comparison of the performance of Yuraken Uchi's skill with the arms of the Kumite players in the sport of Karate." Methods: The researcher used the descriptive approach using the mechanical analysis based on the videotaping method and the kinetic analysis. The three-dimensional biomechanical analysis was conducted for the (16) attempts of the left and right punching arm using the skillspector 3d kinetic analysis program using (2) cameras with a frequency of 60 frames / s. The study sample is an international karate player Results The presence of a large degree of symmetry between the biomechanical and biomechanical indicators of the moment of back support for the skill of Uraken Uchi using the right and left arm. There is a high degree of symmetry between the biomechanical indicators of the moment of achieving the punch skill of Uraken Ochi using the right and left arm. There is a high degree of symmetry between some biomechanical variables for the final moment of the back punch skill using the right and left arm. There is no significant symmetry in the index of the angle of the knee joint of the stabbing front leg for the final moment of the Yuraken Ochi skill using the right and left arms. Keywords: Uraken Uchi: It is an offensive skill that the player performs using the back of the fist