We investigated relationship between serve speed and the result of field test, basic strength test for junior tennis players. We found some correlations between the maximum serve speed and some measurements such as grip strength, back strength medicine ball throw and handball throw. However we found less correlations in girls.We also studied the training effect of junior tennis players. For this purpose we made training program and 27 junior tennis players participated the training for three months. The training program intended to increase serve speed. The training program was consisted of the followings. 1) medicine ball training 2) priometrics training 3) weight training, 4) sprints. The girths and length of limbs increased in boys and girls. The upper limb power measurements increased in boys. The increment was more remarkable in girls. The lower limb power measurements did not increase except girl standing three step jump. The muscle strength generally increased but back strength. Maximum serve speed did not increase. Some strength measurements increased but maximum serve speed did not for three month. This dissociation may arise from the technical requirement for serving. In maximum serve speed measurement, ball should bound on the service court. So not only speed but control was required. During the three months, it may be too short for the players to make their strength to contribute their serve speed.
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