A stadium of primary school was taken as an example, by establishing the finite element model with ANSYS, the vertical vibration of long-span prestressed secondary beams floor system worked with different jumping frequency, number of persons and jumping numbers were analyzed. The results show that, compared with the measured values, the modified half-since-power model has a relative error of 12.98%, which is closed to the measured values; vertical vibration acceleration caused by different people jumping synchronously increases with number of persons rising; considering the people can't jump synchronously the multiplication factor is introduced to correct the jumping loads model.