The silicone grease composition consists of silicone oil 5-50 wt%, heat conductive filling 49.9-94.9 wt% and coupling agent 0.1-5 wt%. The silicone oil has viscosity of 50-50,000 cs at 25deg.c, the coupling agent is at least one of titanium coupling agent and aluminum coupling agent and the filling has high solid content. The silicone grease composition has low viscosity and excellent heat conducting effect.