The purpose of this study was to investigate the physical fitness parameters of basketball players in the substructure team. Totally 98 athletes of Fenerbahçe team who consisted 32 junior, 38 senior and 30 young players participiated the study.

Age, height, weight, 20 m sprint, vertical jump, anaerobic power, right and left hand grip, back strength, leg strength, max VO2 and flexibility parameters were measured in this study.

There was significant differences between height, weight, vertical jump, anaerobic power, right and left hand grip, back strength and leg strength parameters (p<0,01) in groups. According to the Tukey HSD results; Except for 20m sprint parameter, above parameters had an increase significantly.

In the compare of groups, there was significant differences between max VO2 and flexibility parameters (p<0,05 and p<0,01).

As a result, while many of elit junior basketball players who have different categories have a development the parallel as a related with their category, it is shown that there is a fluctuate in flexibility parameters.