The invention discloses a dynamic analysis method for a tennis ball motion locus processing system. The dynamic analysis method comprises the following steps that first, a plurality of cameras are mounted around a tennis court, moving athletes and a moving tennis ball on the tennis court are shot by using the cameras, thus the motion loci of the athletes and the tennis ball are obtained, the obtained motion loci are sent to the processing system for processing, the system analyzes the motion loci, the athletes observe the optimized virtual movements, then targeted training is carried out, thusthe athletes can give up the made mistakes, further, the strength of the athletes is improved, and finally, a good training effect is obtained. According to the method, the monitoring result is analyzed through the system, then the differences between a practical motion curve and the optimal curve of the athletes are obtained, the system obtains the parts needing to be improved of the athletes according to the differences, then the athletes perform targeted training, and further, a good training effect is obtained.