Due to various complex environmental factors, such as the geographical location of mountain PHOTOVOLTAIC power station, the terrain is undulating, the slope aspect is different, some regions are interlaced with ravines, some regions are accompanied by small water gullies or plateau rock bud remnant hills, and the available area is different, relatively scattered and so on, so the design and construction of this type of power station is quite difficult. Therefore, in the design of photovoltaic support in mountainous areas, it is necessary to design according to different slopes, and provide the cutting length of rear column, rear stay and inclined support under different slopes. In the general layout plan, it is necessary to indicate the slope of different slope directions in each region, count the quantity of materials of different lengths according to different slopes, and mark the slope in the subsequent construction according to the drawings and select materials of different lengths to reduce cutting waste as much as possible.