In this study，we investigated the adjustment mechanism of trail limb clearance when stepping over obstacles of different heights． Measurements were taken using three-dimensional motion analysis on 18 healthy young males． The results showed that the obstacle leading edge clearance and the highest point clearance did not match，but the obstacle was raised to a height close to the highest point when the leading edge of the obstacle was reached． Furthermore，it was confirmed that the foot contact positions in front of and behind the obstacle were kept constant，suggesting that this may contribute to the avoidance of contact with the trail limbs． The results of this study are expected to deepen our understanding of obstacle avoidance strategies and to serve as a guide for clinical application in fall prevention．

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