Abstract: The present study aims to improve the aerodynamic stability of a single-axis PV tracker. The effects of turbulence intensity, natural frequency and damping ratio on the aerodynamic stability of the single-axis PV tracker are studied by a sectional model wind tunnel test to reveal the sensitivity of these parameters. The results show unstable torsional vibration of the single-axis PV tracker system in a large tilt angle range with strong aerodynamic coupling and self-excited characteristics. The critical wind speed for the unstable vibration is low. The critical wind speed is high at 0° tilt angle (PV module is horizontal). The increase of turbulence intensity leads to the increase of the unstable vibration tilt angle range, which is not good for the aerodynamic stability. Increasing the damping ratio has an inconsiderable effect on increasing the critical wind speed at small tilt angles (0° and 5°). However, it works well when the tilt angle is larger than 15°. With the increase of natural frequency, the critical wind speed is significantly increased at all tilt angles.