Acceleration response is an important index of evaluating system, at the same time due to the frequent scheme changes in the structure design stage, how to quickly and efficiently calculate the acceleration response of the structure is especially important. First this article adopts APDL to establish the long-span beam finite element calculation model based on standard pedestrian excitation load model and analyses the dynamic response of the beam in different frequency, damping, span, boundary condition by a large number of time history analysis calculation,then get the maximum acceleration response spectrum envelope and gets the maximum acceleration response spectrum curve,finally comparing with some scholars recommend results. Overall the load model is more accurate;and adopts the finite element analysis to eliminates the error of using flexural function instead of horizontal displacement response during the numerical analysis;also solves the lesser result problem by using the first type vibration acceleration response instead of the acceleration response of the structure .