Abstract: Chooses the 32 female juvenile gymnasts from Wuhan Institute of Physical Education，takes picture with the X-ray on left hand twist to confirm the bone age，and to evaluate the development status with the bone age，explores the influence of tournament gymnastics to the juveniles′development. The results show that：as growing，the experimenter have the tendency of development delay，the wrists′ development are later than the development of radius，ulna，metacarpus and finger bones.

Key words: X-ray, juvenile gymnast, development