Badminton has gained a lot of popularity and fans as an exciting and refreshing game. This sport includes various movements of running, jumping, hitting, bending and pulling the body quickly and is enjoyable for the player. In the game of badminton, its name is considered a fatal blow, because approximately 53.9% of points in this game are obtained in this way. A ready badminton player, in addition to having good physical and mental preparation, must also have a high ability in performing the skills of this sport. Even if an athlete is at the highest level of physical and mental preparation, there are still some things that are involved in the athlete's failure. One of these factors is fatigue. Therefore, the main aim of this study was to investigate the effect of functional kinematic fatigue of the shoulder and elbow joints on the movement of badminton in skilled male players. The current research, which was conducted semi-experimentally, and the statistical sample of this research included 17 skilled male badminton players (age: 22.25±3.02 years, height: 177.85±4.86 cm, body mass: 9.3 75.93 kg and sports history: 5.41 ± 2.6 years). which were selected purposefully and available Variables of racket head linear speed, racket head linear displacement and range of motion of the elbow joint during hitting were measured against 6 three-dimensional optoelectric cameras of motion analysis system. Also, the range of motion of the shoulder joint was examined by a goniometer. In the pre-test, the range of motion of the shoulder joint was measured, then each person hit his name 3 times with full strength and speed. After applying the functional fatigue protocol, in the post-test, the range of motion of the shoulder joint was measured again, and each person hit his name 3 times in the field of view of the cameras, and the data was recorded. Independent t-test was used to compare the variables before and after the fatigue protocol. It should be noted that a significance level of less than 0.05 was considered. The research results showed that the linear speed of the racket head (p=0.055), the linear displacement of the racket head (p=0.07), the range of motion of the shoulder joint (p=0.001) and the range of motion of the elbow joint (p=0.062) p) The results showed that fatigue strongly affects the range of motion of the shoulder joint and causes a sharp decrease in this parameter. Finally, according to the statistical results, it can be said that the shoulder joint is considered the most important joint in the shot, and badminton athletes and coaches should pay more attention to this joint.