<b>Synthesis and Characterisation of CDSE Nanoparticles by Chemical Precipitation Method</b> CdSe nanoparticles were synthesized using a simple chemical precipitation method at room temperature in different Cd Se ratios. The nanoparticles were characterized using x ray diffraction XRD ,high resolution scanning electron microscopy HRSEM ,energy dispersive X ray analysis EDAX . XRD pattern reveals that the nanoparticles are in well crystalline Hexagonal phase.The broadening of diffraction peaks indicated the formation of particles in the nanometer size regime.HRSEM images of Cdse nanoparticles of CdSe in different Cd Se ratios shows different morphologies. The elemental analysis from EDAX shows that the prepared samples are exactly stoichiometric. CdSe nanoparticles, x ray diffraction, nanocrystals, sem image 2582-2585 Issue-3 Volume-2 A. Jesper Anandhi | R. Kanagadurai | A. Mercy | B. Milton Boaz