Purpose: This study examined the effect of aquatic exercise on the improvement in physical and pulmonary function after stroke. Methods: Fourteen candidates, who had experienced stroke, were enrolled in this study. The program was carried out three times weekly, 1 hour per session and for 10 consecutive weeks. At pre-treatment and post-treatment, the subjects were tested with a 10 m and 100 m timed gait test, a timed get up and go test, a functional reach test, the difference in thoracic girth at inspiration and expiration, and breaths per minute. The forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) were measured using a spirometer. Results: After ten weekends of an aquatic exercise program, the subjects showed a significant difference in all the test results except for the FEV1 (p<0.05). Conclusion: Intervention with this aquatic exercise program can improve the physical and pulmonary function in people who have had a stroke.