The Biokinematics indicators for the accuracy of the first serve skill of tennis players The research aims to lay some applied scientific foundations to improve the educational process of transmission skill, through biokinetic analysis. The researcher used the descriptive approach using three-dimensional mechanical analysis, and relied on the high-speed video imaging method. The research sample was chosen in a deliberate way represented in (3) Players from Al-Said Sports Club in Dokki and registered with the Egyptian Tennis Federation, and (9) correct attempts were selected, as (3) correct attempts were selected for each player,The researcher conducted the basic study on Monday, 6/9/2020 in the Shooting Sports Club in Dokki on open dirt courts. The most important results were that there is an inverse correlation between the angular velocity of the right shoulder and the level of accuracy, where the value of the correlation coefficient reached (-0.873) Inverse correlation, meaning that the lower the angular velocity of the right shoulder, the higher the level of accuracy. The researcher attributed this to the fact that the skill of sending is a separate skill (single movement), meaning that it has a clear beginning and end.