Objective: To investigate the effect of slow walking speed on the gait. Method: Twenty healthy young male subjects were recruited. The temporospatial data, kinematic and kinetic data in sagittal plane at two different walking speed (2 km/hr, 4 km/hr) were obtained through three dimensional analyzer with the force plate, and compared these parameters at slow gait speed to those at normal gait speed. Results: The cadence and step length decreased significantly and double support time increased significantly (p