To accurately assess the wind loads on photovoltaic （PV） arrays installed on different sloping terrains， wind tunnel tests and CFD numerical simulations were used to study the wind pressure distribution law on the surface of mountainous PV arrays， and the influence of the wind angle， slope and module tilt angle on the wind loads on PV arrays and the interference effect between modules. The results indicate that a wind direction angle of 0° produces the largest wind pressure distribution and highest mean wind pressure coefficient， representing the most unfavorable wind direction. Increasing the module tilt angle increases the wind pressure on front-row modules， and strengthens the interference effect between modules. Sloping terrain weakens the shading effect among PV arrays. With the increase of the slope， the module wind load does not increase with the increase of the contact wind speed （as the elevation of the rear modules constantly increases）. Instead， it initially decreases and only begins to rise when wind loads transition from wind pressure to wind suction. CFD simulation of wind loads on large-scale PV arrays reveal that shading effects between longitudinal columns are not significant. The influence of topography on the mean velocity of the airflow and turbulence characteristics was also investigated.