Numerical simulations are performed to evaluate the ground effect of ground-mounted photovoltaic panel. The simulation results agree well with the wind tunnel experiments in aerodynamic force characteristics. The visualized simulation results showed that the blockage effect increases the pressure under the panel, and the separation vortex at the leading and trailing edge decrease the pressure on the panel. The flow pattern changes as the panel approaches the ground. The change of the flow pattern suggests that the blockage effect and the behavior of the separation vortex at the trailing edge influence well on the ground effect.