Abstract: The average wind pressure on the internal surface of a super large hyperbolic cooling tower with different internal main components is simulated by the CFD method. Based on a computational fluid dynamics software, secondary development was implemented by applying the method of source terms, and the average wind pressure on the internal surface of a super large cooling tower with no internal components, as well as cooling towers with various combinations of a cross baffle, fill zone, and rain zone installed, are simulated. Research on the effects of the main internal components of the cooling tower on its inner pressure is conducted and the influence on the tower of the various conditions is obtained. The flow characteristics inside and outside the cooling tower and the mean pressure coefficient of the inner surface of different tower heights are obtained, and the distribution characteristics of internal pressure coefficients are analyzed based on the mechanism. Results are in good agreement with those from codes and wind tunnel test results. Finally, the shortcomings of the current code regarding internal the surface pressure coefficient are discussed, and recommended values are given. This research provides methods and a basis for the calculation of the internal pressure in super large cooling tower design.