The objective of this study is to establish an indication method for the degree of the recognition of change of floor system in walking space, focussing on the effect of hardness and walking sound. First, using twenty-five sets of two sample floors, the psychological scale to measure the degree of the recognition is constructed by the sensory test. Second, hardness and walking sound of sample floors are measured by using two apparatuses. Finally, on the basis of the difference of hardness and walking sound, the psychological scale is represented, and the index of the degree of the recognition is proposed.
