A light trapping structure of solar cell is proposed by the theory of light scattering and guided mode resonant. The porous anodic alumina (PAA) is used as a scattering layer. The thicknesses of the model are: window layer (AZO) is 320 nm, buffer layer (In2S3) is 65 nm and absorbing layer (SnS) is 660 nm. The simulated and experimental results show that the absorption of solar cell structure can be enhanced by light scattering and guided mode resonant. The absorption is enhanced by about 3% by the light scattering structure. This design can optimize the absorption spectra of this film solar cell and improve the absorption ability of near-infrared light. The absorption at the wavelength of 950 nm is enhanced to 85%, and the solar energy is better used.