Abstract: The PbSnO₃ nanoparticles were prepared by hydrothermal synthesis method using the organic base tetramethyl ammonium hydroxide［N(CH₃)₄OH］ as mineralizer. The formation and structure of PbSnO₃ nanoparticles were characterized by XRD，TG-DSC，and IR.The photocatalytic activity of nanoparticles on methylene blue was also investigated．Results showed that the pure cubic PbSnO₃ nanoparticles could be pretty easily prepared at relatively low temperature and short time even down to 120 ℃ and 5 min with the application of the organic base N（CH₃）₄OH.The pH of precursor solutions was crucial to produce pure PbSnO₃ nanoparticles and it must be over 13.When the photocatalysts were irradiated by the visible light，the photo-degradation of methylene blue solution could reach 88.5% as the concentration of photocatalyst was 60 mg/L and the reaction time was 100 min．

Key words: PbSnO₃ nanoparticles, organic base tetramethyl ammonium hydroxide, photocatalytic degradation