Background and Purpose: The objective of this study was to find out the effect of the active pelvic tilting exercise in standing posture made on gait initiation through the analysis of video film. Subject and Methods: We performed a pilot study with a subject who is a man, 29 years old with left hemiplegia due to traumatic brain injury. He had been treated three times a week in outpatient clinic of Severance Rehabilitation Hospital. The study was carried out with time-series design by single subject design for four weeks from October to November 2006 and filmed once every Wednesday. The acceleration time, deceleration time and one step time were computed based on the data gotten from thirty pictures per second by filmed dynamic image being inputted into computer. Results: The results of the speed by each period of step before and after treatment through the constant active pelvic tilting exercise in standing posture were as follows: After treatment, all of acceleration time, deceleration time and one step time were increased every Wednesday compared with that of before when the date was evaluated. As to the variation time for four weeks before and after treatment, the acceleration time, deceleration time and one step time were getting shorter. Conclusions: It could be concluded that the active pelvic tilting exercise in standing posture contributed to improve the movement quality and speed of gait initiation during the weight bearing on affected side leg.