Abstract: Cable-supported photovoltaic (PV) systems have relatively low structural stiffness and low frequencies, which are prone to large deformations and vibrations under wind loads. Wind tunnel tests on an aero-elastic model of a 41.6 m×29.8 m flexible PV array system were conducted to investigate its wind-induced vibration characteristics. Test parameters included the type of upstream flow fields, wind speeds, wind directions, magnitude in tension forces of cables, as well as the angles of attack. The test results show that such type of flexible PV system can effectively prevent the flutter phenomenon which may occur in a single row flexible PV system; the displacements of PV modules at different positions of the array vary greatly; when the two sides of the array are windward under several wind directions, the edge parts of the array have larger mean and fluctuating displacements; at the same mean wind speed, the mean displacements of PV modules under uniform smooth flow fields and boundary layer flow fields are similar, while the fluctuating values differ significantly; meanwhile, the wind-induced vibration coefficients in boundary layer flow fields are significantly greater than those in uniform smooth flow fields; Besides, as the tension force in the cables decreases, the absolute values of the displacements of PV modules show an overall increasing trend, but the increasing ratio is different at different positions of the array; Increasing the angles of attack significantly enlarges the displacements of PV modules under some wind directions.