Bi2S3 nanomaterial was synthesized by the method of chemical bath deposition and its morphology, construction and capacity of degradation organic pollutant were tested. The results showed that Bi2S3 nanoparticles had rough surface and good photocatalytic degradation efficiency for methylene blue (MB); The addition of surfactant polyethylene glycol (PEG) was conducive to decrease the size of Bi2S3 , to increase the specific surface area of Bi2S3 and promote separation of photoinduced electrons and holes and enhance photocatalytic degradation activity of Bi2S3.