The present project work has mainly focused on reviewed structural and optical properties of pure and Al, Cu doped Tin oxide (SnO2) Nanoparticles. The structure and nature of SnO2 Nanoparticles with different percentage of Al (5%, 15%, and 25%) and Cu (0%, 1%, 3%, and 5%) Nanoparticles are determined by X-ray diffraction analysis. Moreover, the optical properties of the samples are investigated with UV-Visible and Pl spectra. In this project, the band gap, particle size and index of refraction of SnO2 Nano particles were calculated from UV Vis and PL spectra using Brus model, Max Planck’s and moss relation and compared to the experimental value. As the Al concentration increased from 0% to 25%, the energy band gap increased from 3.8 ev to 4.02 ev and the particles size decreased from 4.68 nm to 3.98 nm for Al doped tin oxide. For cu doped tin oxide when the Cu concentration increased from 0 % to 5%, the band gap energy decreases from 3.42 to 3.16 ev, and the particle size increased from 11.29 nm to 23.96 nm. The band gap energy of pure and Al, Cu doped tin oxide (SnO2) nanoprticles inversely proportional to the index of refraction calculated by most relation formula. That means for Al doped Tin oxide Nanoparticles index of refraction decreased due to the increase in band gap energy with the increasing of Al concentration whereas, for Cu doped Tin oxide Nanopartics the calculated index refraction increases due to the decreasing band gap energies with increasing of Cu concentration. KEY WORDS: Nanoparticles, SnO2, Al-doped, Optical properties, Semiconductor, XRD, UV-VIS Spectroscopy, Crystallite structure.