The windinduced vibration performance of super long parallel cables was investigated through a series of systematic aeroelastic model wind tunnel tests. The twin cables with different attack angles and spacing ratios were tested, and the characteristics of the motion track and the suppression measures were researched. Studies have shown that the downstream cable motion is elliptical and the vibratory direction is inclined to the wind axis. The direction of the elliptical orbit is such that the cable moves downstream near the outer edges of the wake and upstream nearer the center of the wake during the process of wake galloping. When the wake galloping occurs, the downstream cable absorbs energy from the wind flow at constant velocity and the amplitude changes slowly, while with the increase of wind velocity, the amplitude is growing quickly until an apparent limit cycle is reached. However, this motion consists of large oscillations in an elliptical orbit with the long ellipse axis oriented approximately along the main flow direction rather than inclined to that. Finally, the separator measures are carried out to suppress the wake galloping, and the study results can direct both the wind-resistant design and the vibration control of the parallel cables in cable-stayed bridges.