Abstract: To investigate the changing patterns of multi-bundled sub-conductor aerodynamic coefficients versus the Reynolds number and the wind attack angle, rigid models of two, four and eight bundled conductors are designed and manufactured, and the surface roughness of real conductors is imitated, and high frequency force wind tunnel tests with different wind velocity and wind attack angle are carried on, and the results are compared with existed ones at home and abroad. The results show that the influence of the Reynolds number on multi-bundled sub-conductor drag coefficients is different from that on single conductor drag coefficients; upstream sub-conductors have shielding effect on downstream ones, drag coefficients of downstream sub-conductors become smaller with the decrease of the shielding distance; as the turbulence intensity grows, the shielding effect on drag coefficients is weakened, and drag coefficients of downstream sub-conductors grow, however, the shielding effect is still obvious and the influence of wake interference around sub-conductors on drag coefficients can't be ignored, so it is recommended to add sub-conductor drag coefficients into the code in consideration of the shielding effect.