Abstract: he organic molybdenum compound, molybdenum dialkydithiocarbamate (MoDTC), was prepared. The functional group and element content of the compound was determined. The thermal stability was tested by TG-DSC. Its tribological properties in lithium base grease were evaluated by four-ball friction tester and compared with MoS2. The results show that MoDTC possesses a good thermal stability, the physicochemical property of the lithium base adding MoDTC grease is unchanged. Compared with the blank lithium base grease, at 392 N loading, the best anti-friction effect is achieved at 3.0% of MoDTC in grease, the average friction coefficient could reduce by 40.2%, and the mass fraction of MoDTC in grease is 2.0%, when the wear scar diameter is reduced by 29.8%.