The finite element modal analysis of a typical single-circuit 500 kV high-voltage transmission tower is carried out. Then, the computing method based on the non-steady wind forces in frequency domain is applied to the wind-induced responses calculation of the transmission tower, the effects of main frequency domain parameters such as number of modes numbers, cross terms of modes and damping ratio of structures on the response are discussed in detail. The results show that for the superstructure of tower, the calculation accuracy of displacement response can be ensured only by taking into account the bending (x,y direction) and torsional (z direction) first order integral mode shape. And the mode numbers have great influence to the calculation of acceleration responses, the accelerations of transmission tower are monotonously increasing with the mode numbers. And the contribution for base bending moments mainly comes from the first bending mode. Furthermore，the wind-induced responses of transmission tower are sensitive to the structural damping ratio, especially, the resonant responses obviously decreased with the increasing of damping ratio, but the change of damping ratio has little influence on low frequency part of responses. What is more, the cross terms of modes can be neglected for the responses calculation of typical single-circuit transmission tower in frequency domain.