The research aims to compare the effect of training with short and long intervals on developing some of physical and physiological variables ( vo2max , Maximal aerobic speed , and anaerobic abilities) and the time-trial level of 1500-m runners, The researchers use experimental methodology with two groups design (2 experimental groups) and pre-post measurements, The research sample was chosen in Purposive method, 20 physical education students (Athletics specialization) were divided as follows (10) students of short intervals training group, (10) students of short intervals training group, The researchers add students of short and long intervals training programs ( 8 weeks by two training units per week) as additional training units, the results of this study were both training with short and long intervals has a positive effect on developing some of physical (sprint , speed endurance , muscular power , endurance) and physiological variables (Vo2max , Maximal aerobic speed , time to exhaustion , anaerobic abilities) and the time-trial level of 1500-m runners, and there are no statistical differences between the two experimental groups, The researchers recommend to use both training with short and long intervals training on developing physical and physiological variables and the time-trial level of 1500-m runners and compare them with another training styles which divided from High-intensity interval training.