A number of thermal conductive materials, which could be used as a filler for composite material is considered in the paper. The reviewed materials include both metallic materials (aluminum, copper, tungsten) and non-metallic ones (ceramic and carbon materials). Great attention is paid to the main kinds of composite materials (liquid metal and silicone based).In conclusion thermal greases widely applied nowadays are analyzed and a number of hypothesizes is made about development of the branch in the future.