Experiments were conducted to evaluate the floor vibration characteristics by human walking on actual floors of over-track buildings (two railway stations). The following conclusions were obtained. (1) It is confirmed that the resonance vibration occurs when the frequency of response acceleration is almost same to integer multiples of the up-down frequency of the floor. (2) The floor vibration by five walkers is almost same as the characteristics of the floor vibration caused by the crowd and (3) It is not uncomfortable under V-90 of evaluation curves provided in the guideline of A.I.J..
