The development of methods to synthesize BaTiO3 nanoparticles for the preparation of nanorods is discussed. BaTiO3 nanoscale materials are considered as very important ferroelectric materials with potential applications in photoelectric devices, multiplayer ceramic capacitors, auto thermostat meters. The coating technique is widely used to modify the performance of materials, and polyaniline (PAn)-BaTiO3 nanocomposites are prepared, with PAn as the core and BaTiO3 as the shell. The result shows that stable core-shell particles consisting of a polyaniline core and a barium titanate shell can form nanorods at suitable temperature conditions.