The researche was done in a sample of 35 young school age girls, non-swimmers, with the aim of determining the effects of an experimental training swimming program, in a time period of three months. Basic aim of the swimming program was learning and development of tehnical knowledge in swimming tehniques, breaststroke, freestyle and backstroke. Duration of the experimental swimming program was 90 days. The partial quantitative changes in swimming preformance and basic – motor skills at girls that were attending this program was analysing by applying the pairwise t- test . After conducting the experimental program and monitor of the initial and final measurements, it was found that there have been significant transformations in all processed varijables in both spaces.