Wind tunnel tests were carried out to study the wind load characteristics of flat uniaxial photovoltaic panels with large aspect ratios. The most unfavorable incoming wind direction of photovoltaic panels， effects of inclination angle， the wind load distributions of the isolated model， and the array models are analyzed， respectively， considering the arrangement form of the single cell and the array， seven kinds of photovoltaic panel inclination angles from 0° to 60°， and seven incoming wind directions. The interference effect on wind loads for array arrangement is discussed. The test results are compared with the wind resistance codes of four countries， and the recommended values of the wind force coefficient are given. The study found that 0° and 180° are the most unfavorable wind directions for photovoltaic panels and overturning bending moment. The overturning bending moment coefficient around the rotating axis， the overall wind force coefficient， and the distribution and magnitudes of the local wind force coefficient are affected by the inclination angle of the photovoltaic panel and the direction of the incoming wind. For the overturning bending moment coefficient around the rotating axis， the flat uniaxial photovoltaic panel with a small inclination angle has larger values compared with the flat uniaxial photovoltaic panel with a large inclination angle. For the entire wind force of the photovoltaic panel， the flat uniaxial photovoltaic panel with a large inclination angle is more severe. The local wind force coefficient distribution presents a gradient change， the largest local wind load is found on the windward corner， which changes dramatically due to airflow separation.