As an important method to calculate the dynamic response of structure, random
vibration analysis is efficient as other method, like response spectrum method, time history method and
so on. In the paper, the procedure for transforming response spectrum to power spectral density
function attentively is studied. According to Chinese new bridge seismic code, the research on the
parameters of Clough-Penzien power spectral model is carried out. The relations between
Clough-Penzien spectral intensity and the mean value of maximum ground accelerations, or the
earthquake intensity and maximum earthquake affecting parameter are derived. The parameters given
in the paper provide a theoretical base for stochastic response analysis of structure.
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