Purpose: The Tokyo Judo Therapist Corporation has sent medical staff mernbers for Tokyo Junior High School Judo Association and Tokyo High School Judo Association in order to provide first aid and injury prevention since March 1998. We analyzed injury reports, and the results in both age groups were compared and contrasted. Prevention methods for each group were discussed and considering literature was done. Method: Data was collected during 5 years, between April 2001and March 2006. Total number of junior high school participants was 19254. Total number of high school participants was 39959. Injury reports were analyzed to obtain injury rate by weight class, percentage on types of injuries, etc. Results: There was staitstical significance by weight in the case of junior high students, especially among women in the heavyweight division. As for type of injury, fracture was more communly seen in junior high students and dislocation in senior high students. Discussion: The outbreak frequency of a heavy class of the girl of the junior high student is high, and there is a difference for the dcvelopment at the stage of the growth each, and a peak visits it in order of the acquisition of the movement, tenacity, height, muscular strength. That is, it is thought that it is the result of producing from unbalance between an incrcase and muscular power of height and weight. Ratio of fracture and dislocation shows age characieristic about Judo injuries. There is flexibility in comparison with the adult and is easy to fracture a metaphysis and epiphyseal growth plate of the child. Height is called growth spark by the time that is suddenly prolonged, and a bone becomes weakest this time. This growth spark time just agrees with a junior high student in the judo competition. Conclusion: It is made use in an exercise and the nourishment management of the usual times when this result thought about an age characteristic, an exercise method and is happy if kept alive for the decrease of the injury,
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