The shoulder impingement syndrome is quiet prevalent amongst all shoulder injuries and mainly accounts for pain and mobility limitation in that region. Therefore, the aim of this study was to investigate the effects of rhythmic stabilization exercise on position sense, range of motion, strength and functional stability of shoulder in adolescent girl swimmers with shoulder impingement syndrome. In this study, 30 swimmer girls with shoulder impingement syndrome were randomly divided into two groups of experimental and control. After pre-test measurements from the two groups, including proprioception, strength, range of motion and functional stability, the experimental group performed four weeks Rhythmic stabilization exercises and then the post-tests were performed for the two groups according to the pre-test. Results indicated that position sense, rotator muscles strength, and functional stability of shoulder joint significantly improved after rhythmic stabilization exercises compared to the control group (p<0.05). There was no significant difference in the range of motion between the two groups (p>0.05). It seems that, rhythmic stabilization exercises can be used in order to improve proprioception, shoulder rotator muscles strength and the functional stability of swimmers suffering from shoulder impingement syndrome.