Abstract: To investigate impact of photovoltaic array configurations on shading environment in agricultural photovoltaic complementary system, three regions at different latitudes, Changchun City in Jilin Province, Xining City in Qinghai Province, and Fuzhou City in Fujian Province, were selected as meteorological data sources．Rhino software were employed to construct multi-parameter photovoltaic array models．Through Ladybug simulation, effects of different array configurations and geographic zones on cumulative irradiance（CI）distribution in shaded areas beneath arrays were analyzed．Results has indicated that height and spacing of photovoltaic arrays play a critical role in regulating CI distribution and uniformity beneath panels, with effects varying by latitude: Changchun City（high latitude）can optimize uniformity by increasing height; Xining City（medium latitude）requires balancing P-zone（beneath the panels）gain and S-zone（between the panels）attenuation; Fuzhou City（low latitude）should avoid uniformity degradation caused by high array height and wide spacing．Shading ratios between P-zone and S-zone differed by up to 70.8%, while advantage of the southernmost array region diminished as latitude decreased．These findings provide a parameter optimization framework for agricultural photovoltaic complementary system design across different climatic zones．