The purpose of this study was to determine the influence of pelvic tilting exercise on the gait speed and the energy expenditure of adult hemiplegic patients. The subjects of this study were 15 hemiplegic patients, who were either hospitalized in or out patients, who had not have disease of respiratory and musculoskeletal system, at the Yonsei Rehabilitation Hospital. The patients who could walk over five minutes, were treated pelvic tilting exercise in sitting position based on the Bobath concept. Gait speed was measured comfortable speed before and after the exercise during five minutes. Simultaneously oxygen consumption was measured using Oxylog2 (Morgan, England). The results are as follows: 1. The energy expenditure after pelvic tilting exercise was decreased 26% from average 0.39980 ml/kg.m to average 0.29460 ml/kg.m than before (p<0.01). 2. The gait speed after the exercise was increased 14% from average 0.3720 m/s to average 0.4313 m/s than before(p<0.01). 3. The energy expenditure change and the gait speed change had a negative correlation of 0.61 before the exercise(p<0.05) and a negative correlation of 0.66 after the exercise(p<0.01). In conclusion, pelvic tilting exercise increase gait speed and decrease energy expenditure of hemiplegic patients. Gait speed and energy expenditure have a negative correlation.