In order to obtain the aeolian vibration property of large cross-sectional conducts JL1X1/G2A-1520/125-481 used for ultra-high voltage(UHV)power transmission, governing equations for aeolian vibration of this type of conduct were constructed. The double amplitude, allowable amplitude, and power dissipation per unit length at 16 equally spaced frequency points in a band of frequencies between 8 Hz and 80 Hz were calculated, and the dynamic bending strain and stress at the suspension point for each frequency point were determined by the maximum amplitude at the antinode. Study shows that, under the self-damping vibration condition, the double amplitude of the conduct increases first and then decreases with the increase of the frequency, with a maximum value at a frequency of near 20 Hz, and the vibration amplitude of the conduct exceeds the allowable value when the vibration frequency ranges from 20 to 40 Hz. The power dissipation per unit length increases first and then decreases with the increase of the frequency, and reaches the peak value at a frequency of 40 Hz. In the band of frequencies between 20 Hz and 40 Hz, the dynamic bending strain and stress of the conduct were greater than their allowable values. Compared with the weakest band of frequencies between10 Hz and 20 Hz of the common cross-sectional conduct, the weakest band of frequencies of large cross-sectional conduct JL1X1/G2A-1520/125-481 is between 20 Hz and 40 Hz, which should be paid more attention in vibration prevention and damping schemes.