Barium titanate nanopowders, and composite materials of barium titanate/ graphene oxide (10 wt.% of graphene oxide according to the initial composite composition) were synthesized by hydrothermal method at the fixed reaction condition of 200 oC and 24 hours. The obtained powders were characterized by different techniques: X-ray diffraction, FTIR spectroscopy, Particles size distribution, and Scanning electron microscopy. Zeta potential measurement under electrophoretic mobility technique was also employed to investigate the stability of the BaTiO3 nanoparticles and composite materials of barium titanate/graphene oxide. The results showed that the BaTiO3 present with the tetragonal crystal structure (P4mm, a = 4.0000 Å, c = 4.0109 Å) and has uniform morphology with the grain sizes are in the range of 70 - 140 nm. The BaTiO3 nanoparticles were well distribution and covered on a surface of graphene oxide. The BaTiO3 nanoparticles, and BaTiO3/graphene oxide are stable in alkali, neutral media, and acidic media up to pH ~ 5.