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Gait analysis is a very important procedure in assessing and improving many quality of life indicators. In sports, gait analysis can be used to improve athlete's performance and injury prevention. This paper presents the development of ultrasonic system in wearable instrumented shoes for gait analysis measurement in sport application. This paper begins with introduce to the requirement in the related literature. The explanation on the system configuration follows next that describes sensor properties and time of flight concept. Next, is a section that explains the experimental setup using the proposed instrumentation which is then followed by the result section. Finally, the planned future works shares in this paper.