The computational fluid dynamics(CFD) methodology is employed to obtain the wind pressures on the inner surface of large hyperbolic cooling towers.The wind pressures on the inner surface of cooling tower,which are induced by the action of outer wind field and self-circulating system due to air temperature difference,are calculated numerically with the k-ε turbulence model and multiphase model,respectively.The distributions of these two parts of wind pressure with respect to height and latitude are then investigated.The resultant wind pressures on inner surface on cooling tower are obtained and their suggestive values are given.Results from this study show that the wind pressures on inner surface induced by the action of outer wind field vary significantly with heights and latitudes,whereas those induced by self-circulating system keep almost unchanged with respect to latitude.If the velocity of outer wind field is small,the wind pressure on inner surface induced by self-circulating system will occupy a certain proportion of the resultant wind pressures,while if the velocity is large,it can be neglected.