Abstract:Acceleration response spectrum research in numerical analysis method was introduced, and the defect was pointed out. By APDL, the longspan floor finite element calculation model was established based on standard pedestrian excitation load mode, and the maximum acceleration response spectrum curve was obtained by a large number of time history analysis calculation. The effects of detecting position, damping, span and pedestrians on the acceleration of floor were analyzed and compared with recommending results of some scholars. The results show that the finite element analysis can eliminate the error due to the flexural function instead of horizontal displacement response during numerical analysis. The problem of small structure vibration response by using the first type vibration acceleration response instead of the acceleration response of the structure is solved by the proposed method.