We have numerically investigated the effects of light scattering by silver nano-particles on the surface protection sheet of an amorphous silicon solar cell. The structure consists of two silver nano particles, a protection sheet, an indium tin oxide layer, and an amorphous silicon solar cell. Two silver nano-particles are put on the protection sheet of the solar cell. The larger diameter of silver nano-particles increases the transmission intensity of the structure at the peak wavelength of 417 nm. The appropriate gap between two silver nano-particles on the protection sheet of the amorphous silicon solar cell increases the transmission intensity of the structure compared with that of the solar cell with less gap at the incident light wavelength of 554 nm. [DOI: 10.1380/ejssnt.2015.83]