Abstract: Aiming at the problem of vortex-induced vibration(VIV)of long span cable-stayed bridges under frequent wind speed,based on Sutong Yangtze River Highway Bridge,the field measured data of wind-induced vibration response of the stay-cable is an-alyzed.The wind tunnel tests of stay-cable segment models whose geometric scale ratio is 1:1 with dimpled surface and smoothsurface winding small diameter helical wies are carried out,respectively.The controleffects of different damping ratios and dfferent helical wires parameters on VIV of stay cable are investigated.The force-measurement tests of the stay-cable with the recom-mended helical are conducted,respectively.The research results show that the stay-cable with indent surface or smooth surfacewith the small diameters(0.014D and 0.025D,D is the outer diameter of the cable)double helical wires exhibited obvious VIV.To increase the damping ratio of the stay-cable or set the double or triple helical wires with diameter of 0.071D and pitch of 12Donstay-cable can effectively suppress the VIV of the stay-cable.When the double or triple helical wires with diameter of 0.071D andpitch of 12D are set on the indent stay-cable,the drag coefcients of the indent stay-cable are increased by approximately 30.8%-48.0%and 60.7%-80.6%compared to the drag coefficients of the indent stay-cable without helical wires,respectively.The RMSvalues of the vertical coefficients of the indent stay-cable with helical wires with diameter of 0.071D and pitch of12D are reducedby about 53.2%-83.7%and 56.6%-80.2%compared to that of the indent stay-cable without helical wires,respectively,which caneffectively suppress the amplitude of the VIV ofthe indent stay-cable.