Abstract: ZnS nanoparticles were prepared by mixing of two TritonX 100/C 10 H 21 OH/H 2O lamllar liquid crystals, in which Zn(CH 3COO) 2 and Na 2S were dissolved in the solvent layer of TritonX 100/C 10 H 21 OH/H 2O lamllar liquid crystal. The size of ZnS nanoparticles was less than 10 nm and confined by the thickness of the solvent layer of lamllar liquid crystal. The lubricity of the mixed system of TritonX 100/C 10 H 21 OH/H 2O lamllar liquid crystal and ZnS nanoparticles was evaluated on a ring on block friction and wear tester. As the results, ZnS nanoparticles improve the anti wear ability of TritonX 100/C 10 H 21 OH/H 2O lamllar liquid crystal. However, they have no effect on the extreme pressure properties of the liquid crystal.