The terrain in mountainous areas is undulating and has varying aspects. In conventional photovoltaic design

the entire project adopts a single azimuth angle

tilt angle

and spacing

which leads to problems such as small photovoltaic installed capacity and low power generation. To fully utilize land and improve the rate of return

this paper first uses the total annual irradiation as the main basis for solar radiation analysis and selects land with suitable orientation and slope. Then

by using the regional dynamic variable method

the azimuth angle

tilt angle

and spacing of photovoltaic modules are optimized and adjusted by region to achieve the optimal layout of photovoltaic systems in different areas. Simulation results verify that

in mountainous photovoltaic design

the regional dynamic variable method can make full use of land and significantly improve photovoltaic installed capacity

power generation

and the rate of return.