Research Objective: This research aims to identify the kinematic characteristics of the lower limb as a determinant for selecting javelin throwers. Research Questions: 1- What is the contribution of the kinematic characteristics of the lower limb to the performance of javelin throwers? 2- Can statistical mathematical equations be developed to predict performance levels? Research Procedures: Research Methodology: The researcher used the descriptive method as it was suitable for the nature of this study. Four 3D cameras were used, and the analysis was performed using Motion Simi software. The research sample was selected purposively, consisting of (3) of the best national team players registered with the Egyptian Athletics Federation. The best (3) attempts were selected for each player, and the best (9) attempts were selected from (11) actual attempts, in order to conduct the biomechanical analysis of these attempts. The importance of the extracted biomechanical indicators for coaches responsible for selecting athletes: 2- The vertical speed of the left leg is the most significant indicator contributing to the javelin throw at the moment of release, accounting for 80.686% of the total. 3- The angle of the left ankle is the most significant indicator contributing to the javelin throw at the moment of release, accounting for 80.708% of the total. - The vertical displacement of the left thigh is the most significant contributing factor in the javelin throw during the release phase, accounting for 75.748% of the total. 5- The angle of the left ankle is the most significant contributing factor in the javelin throw during the release phase, accounting for 81.589% of the total.