The study identifies the effect of leg power of the under 17 Karate Kumithe players. The macrocycle was designed for twenty-four weeks, and the improvement was analyzed within the 11th to 18th weeks of the macrocycle. The training sessions contained three days per week with two and half hour practical. Four male kumirhe players in the under 17 playres was selected with 2-3 years experience by using the purposive sampling method. Three tests were taken at the beginning, during trainning and the end of the training program as pre-test, mid test and post-test, respectively. Verticle Jump test and Maargaria – kelamen power test to test leg power. It was suggested that the leg power training program for karate kumithe players have significant impact on the development of leg power.