By using the lithium base grease as an example,the rheological properties and tribological properties were studied through the R/S cone and plate rheometer and four ball friction and wear tester,and the relationship between rheological properties and friction and wear performance of the greases was investigated.The results show that the apparent viscosity is firstly decreased gradually along with increasing of shear rate and temperature,and increased gradually along with increasing of plate-cone clearance,finally it tends to a stable value.The friction coefficient of grease and wear scar diameter are increased gradually along with increasing of the load,and increased first and then decreased along with the increasing of speed and temperature.The rheological properties and tribological properties are changed in the same trend in general along with the speed,load and temperature changing,which shows certain correlation between rheology and tribological properties of lithium base grease.