The spherical shaped Co3O4 nanoparticles have interesting properties and potential applications in coatings, catalysis, sensors, anode materials in rechargeable batteries, solar energy absorbers, magnetism, etc. Inorganic nanoparticles with controlled size and shape are technologically important due to the strong correlation between these parameters and their properties. We have successfully prepared Co3O4 using a solution combustion method. The phase and purity of the synthesized product was examined by X-ray diffraction (XRD) pattern. Infrared spectroscopy studies were performed aiming to ascertain the metal oxygen bonding and nature of the synthesized cobalt oxide nanoparticles. SEM (Scanning electron microscope images show that the nanoparticles are nearly spherical in morphology and are in the range of 100 to 200 nm.Magnetic property and thermal behavior of the synthesized Co3O4 nanoparticles were studied by magnetic hysteresis loop tracer.