The purpose of this study was to investigate the effects of aqua-exercise program on the balance of one leg stance in the elderly women. Subjects were fifteen member living in Daejon(15 females), between 65 and 77 years of age. The subjects was put in the aqua-exercise program for 8 weeks, between July and september, 2001. The results of this study were as follows: 1. After the exercise program, subjects showed Meaningful increase of the balance of one leg stance. 2. In comparison of balance of one leg stance with the control group, the experimental group revealed a significantly better result in the balance of one leg stance. As a result, this study shows that aqua-exercise program improves the ability of balance in the elderly women. Based on this program, constant health care for the elderly women is needed.