Abstract: According to an example of a large-span bridge, the buffeting responses under fluctuating wind field with different non-Gaussian feature are obtained through the time-domain analysis. Based ACER method, the analysis of the short-term and long-term extreme value for structural responses is conducted. Results show that when the non-Gaussian feature of wind field becomes stronger, the short-term extremal displacement will be larger under the same mean wind speed, and the difference of the short-term extremal displacements with various mean recurrence intervals will increase. Under the same condition, the long-term extremal displacement is larger than the short-term counterpart. In addition, under stronger non-Gaussian feature of wind field, the extent of the growth between the long-term extremal displacements and the short-term counterparts rises. Hence, compared with Gaussian wind field, the extremal displacement of bridges is larger under non-Gaussian wind field, and it is more necessary to consider the effect of the long term.