Abstract: With the continuous progress of PV power generation technology,the price difference between single-sided PV modules and bifacial PV modules is constantly narrowing. Thanks to the large power generation gain,bifacial PV modules are increasingly favored in practical projects. When single-sided or bifacial PV modules are used in PV power generation projects,the installation angle of the PV modules becomes an important consideration factor. This paper selects three regions with different levels of solar energy resources and uses PVsyst to simulate the relationship between the optimal installation angle of single-sided and bifacial PV modules used in PV power stations constructed in these three regions,the first year power generation of PV power stations,and the amount of solar radiation received from the front of PV modules. The following conclusion can be drawn:1) When using the maximum first year power generation of PV power stations as the measurement standard,the optimal installation angle of bifacial PV modules is higher than or equal to the optimal installation angle of single-sided PV modules with shading,but lower than the optimal installation angle of single-sided PV modules without shading. 2) As for single-sided modules,increasing the installation angle of PV modules under unshaded conditions brings a higher power generation gain than under shaded installation conditions. 3) In the absence of shading,increasing the installation angle of PV modules within a certain range can correspondingly increase their power generation. Compared to bifacial PV modules,single-sided PV modules without shading can achieve smaller power generation gains by appropriately increasing their installation angle.Increasing the installation angle also requires a corresponding increase in the spacing between PV arrays,which will increase land use and thus increase the total project cost. Therefore,in practical projects,using bifacial PV modules as much as possible is a more ideal choice.