The barium titanate gel has been made by sol-gel techniques and then sintered at 800 C for its nanoparticles powder. Previously, all of the samples are made into the mass ratio, particularly its notation in gram units to the composition with polyvinyl alcohol. Finally, its perovskite phase of the barium titanate nanoparticles were found and optimum occurs in the proportional mass ratio or BaTiO 3/PVA. By X-ray diffraction equipment, it be examined to got the optimum tetragonal crystallite where it indicates the perovskite phase had been optimal formed. The both of PSA and TEM equipments were uses and found that barium titanate nanoparticles in which dominantly for all of them.