This article reports the lubrication of the mixed system of CdS nanoparticles and Triton X-100/C10 H21OH/H2O lamellar liquid crystals. CdS nanoparticles could be synthesized in the lamellar liquid crystal's solvent layer, limited by its amphiphile bilayer. The CdS nanoparticles were spherical and the size was about 5 nm. The lubrication properties of the mixed system of the lamellar liquid crystal and CdS nanoparticles were determined. The results showed that the presence of CdS nanoparticles could improve the antiwear ability and extreme pressure property of Triton X-I00/C10 H21OH/H2O lamella...