PURPOSE: To examine the effects of reaction ability after12weeks of two different types of exercise intervention in community-dwelling elderly with mild cognitive impairment. METHODS: 72 participants aged over 60 years old were classified as probable mild cognitive impairment(MCI) using the Saint Louis University Mental Status (SLUMS) examination. Participant were assigned to 3 groups (CG, n=22, 74.58±5.78years; RTG, n=24,72.00±7.15years; MEG, n=26, 72.77±5.65years). Exercise groups performed twice-weekly resistance training or multicomponent exercise training for 1.5hours led by certified fitness instructors, and the control groups performed twice-weekly tablet personal computers course for12 weeks. The primary outcome measurewere the simple reaction time and simple movement time were measured by Vienna-test system(VTS), the total body reaction time was measured with both their feet on a measuring instrument (HELMAS NH-3000I). RESULTS: After the training period, of the72 participants, 53 completed 12-week trial (18 in the MEG group, 18 in RT group, 17 in CG group). The total body reaction time for the MEG(-21.93%),and RTG(-9.04%)had decreased significantly than the CG(+1.13%)(p <.05), and the simple movement time for the MEG(-7.41%), and RTG(-0.81%)had decreased significantly than the CG(+27.58%)(p <.05). CONCLUSIONS: These findings indicate that participating in the multicomponent exercise and resistance exercise program on building community for health promotion can improve reaction time in elderly with cognitive impairment. These findings suggest that short time twice-weekly MET and RTG are promising and effective strategies in community-based health promotion activities with mild cognitive impairment.