The cadmium doped aluminium oxide (CdAl2O3) nanoparticles were prepared by reverse precipitation method. The prepared CdAl2O3 nanoparticles were characterized by Powder X-Ray Diffraction in order to confirm the crystalline nature of the sample and found average crystallite size in the range 27.6 nm. Fourier transform infrared spectroscopy confirms the presence of metal oxygen bonds in the CdAl2O3 nanoparticle.