The research aims to study the effect of specific Tabata Training on developing aerobic and anaerobic abilities and change of direction speed for juniors squash under 15 years, The researchers use experimental methodology with two groups design (experimental and control) and pre-post measurements, The research sample was chosen in Purposive method, 12 juniors squash registered in the Egyptian Squash Federation 2016-2017 were divided as follows (6) juniors of the experimental group, (6) juniors of the control group, The researchers add specific Tabata training program ( 6 weeks by three training units per week) as additional training units for the basic program in specific and competition preparation for the experimental group, the results of this study were the specific Tabata training has a positive effect on developing aerobic abilities ( maximum oxygen consumption - maximal aerobic speed - time limit to exhaustion - specific anaerobic capacity ) and anaerobic abilities ( maximum - minimum – average - fatigue index ) and change of direction speed for juniors squash.