Abstract:Abstract: Over the last decade it has become increasingly popular to provide large public areas with gracefully designed "flexible" staircases. Because of its space load bearing system, it is necessary to make vibration analysis under pedestrians’ activity. Because of the differences between human induced loading on a floor with that generated whilst ascending or descending a staircase, the load model induced by pedestrians on s staircase and the vibration analysis method of the staircase are represented in this paper. Finally, the numerical analysis and the vibration site test of a practical engineering example are carried out and verify the feasibility and effectiveness of the load model of pedestrian and the vibration analysis method.