Abstract: In this work, a novel method of microwave assisted chemical precipitation procedure was used to synthesize AgInS2 nanoparticles. Ag, In and S precursors with a stoichiometric ratio of 1:1:2 were dissolved in ethylene glycol as solvent and compolexing agent. The resultant precipitation was placed under microwave irradiation for 5 min to obtain product. X-ray diffraction pattern (XRD) and scanning electron microscopy (SEM) were employed to characterize the final product.