Abstract: In order to better identify several wind load spectra of a long-span concrete filled steel-tube transmission tower from displacements investigated by wind tunnel tests, wind load identificaton processes were simulated by computer. Firstly, selecting three kinds of wind load spectra and acted on model of transmission tower, the structure displacemental spectra were computed by random vibraton method. Then, a method was introduced to identify several dynamic wind load spectra from displacemental spectra of several measuring points and error coefficient was defined to evaluate identificaton effectiveness. Finally, some factors, such as measurement accuracy, number and position of measuring points, modes taken and wind load coefficient,et al, having effect on accuracy of wind load identification were discussed and some important conclusions were gotten so as to guide actual wind tunnel tests.