Abstract: In wind tunnel tests,the Reynolds number plays a crucial role in the evolution of the flows around streamlined structures which determines the evaluation of its wind loading and aerodynamic performances.Previous works suggests the effects of high Reynolds number can be simulated by increasing the surface roughness,but the effects of the simulations are usually influenced by artificial factors.Little is known about the relationship between surface roughness and the change of flow features which makes the practical simulations difficult.Two comparative wind tunnel tests of Hyperbolic circular section structures in difficult Reynolds number range were designed.By changing the thickness of the strips on the model surfaces,the effects of high Reynolds numbers were simulated,including the investigation of both transverse pressure distribution and drag coefficient.A serial of results provide a detailed understanding of the regularity of surface roughness parameters with different model scales,which helps the practices of similar future projects.