Abstract: To compute fluctuating wind pressure via numerical simulation technology requires unsteady tran-sient simulation whose computation load is too huge. In order to raise computation efficiency, this paper substituted reference points' wind velocity by that of forecast points' entrance basing on quasi-steady theory, so the estimation formula by Paterson, Huang et al. got revised. The fluctuating wind pressure coefficients of plate structure supported by independent column were estimated according to parameters produced by CFD such as their mean wind pressure coefficient, reference points' wind velocity, onflow's kinetic energy. In most cases, the outcome coincided with the result of wind tunnel test. The research shows that the parameters obtained from steady simulation result could be used to estimate the fluctuating wind pressure coefficient.