s: In order to study the aerodynamic characteristics of stay cable attached with helical lines, LES Module of Fluent Software was used to conduct numerical simulations. First, two kinds of computational models were established, including smooth and helical cables. Detection points were arranged on 9 cross sections to detect wind pressures and wind velocities. The diameters of helical lines included 2, 3 and 4 mm, and the distance between adjacent helical lines included 200, 300 and 600 mm. Second, numerical simulations using aforementioned parameters were carried out to obtain aerodynamic characteristics of stay cable. Finally, the effects of the helical lines on the mean drag coefficient, fluctuating lift coefficient, vortex shedding, and the correlation coefficient along the cable axis were investigated in detail base on the data obtained from numerical simulations. The results show that the mean drag and fluctuating lift coefficients of the helical cable are both less than the values of smooth cable. Helical lines can break the regular vortex shedding, and decrease the correlation coefficients of wind pressures and wind velocities along the cable axis.