Polyaniline (PANi) as a typical conducting polymer has recently received a great deal of attention. TiO2 photocatalysts thus quickly attracted the attention of global environment and energy researchers. Polymers giving rise to a host of nanocomposite. Also PANi/TiO2 nanocomposite has attracted more attention in recent years. In this work, we report the fabrication and characterization of polyaniline (PANi) / TiO2 nanoparticles heterogeneous structures. This nanoparticle may potentially be applied in different photocatalytic fields, such as water photocatalytic decomposition and toxic pollutant photo catalytic degradation.