This study aims to identify the effect of cross-training for the development of some physical abilities and basic skills at the level performance of juniors National Center for volleyball in Sharqiya , the experimental method with the experimental design was used on one experimental group with a (pre-post) way of measurement. The Research Sample was selected by an intentional way that was represented in 10 juniors of The National volleyball Center in Sharqiya , The proposed training program was applied using cross-training for ten (12) training weeks with three (3) training units per week, Physical tests used (vertical jump, broad jump, medical ball throw, sit-lie down, 20 meters sprint test, (Illinois) agility test, accuracy), Skillful performance used (passing accuracy, serving accuracy, spiking accuracy). Statistical treatment included mathematical mean, standard deviation, correlation coefficient, (T) test, and improvement ratios. The results of the study showed statistically significant differences at the level of 0.05 between the (pre- post) tests in favor of the post – tests in both physical and skillful measurements and tests, attributed by the researchers to the use of cross- training within the proposed training program. The researchers recommend that there is a necessary need to be directed towards using cross-training in volleyball training programs.