NOVELTY - Composite material comprises 100 pts. wt. polypropylene, 40-200 pts. wt. nano heat-conducting filler, 10-50 pts. wt. compatabilizer, 0.5-3 pts. wt. coupling agent, 0.5-3 pts. wt. antioxidant and 1-5 pts. wt. lubricant. The filler is nanoaluminum powder, aluminum oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride or silicon carbide. The compatabilizer is maleic anhydride graft polyolefin elastomer, acrylic anhydride graft polyolefin elastomer or silane-grafted polyolefin elastomer. The coupling agent is titanic acid ester coupling agent.    USE - The composite material is useful for floor heating, solar energy, chemical industry and conveying field.    ADVANTAGE - The composite material has good dispersibility and interface combine property, good thermal conductivity and improved temperature impact resistance.    DETAILED DESCRIPTION - Composite material comprises 100 pts. wt. polypropylene, 40-200 pts. wt. nanoheat-conducting filler, 10-50 pts. wt. compatabilizer, 0.5-3 pts. wt. coupling agent, 0.5-3 pts. wt. antioxidant and 1-5 pts. wt. lubricant. The filler is nanoaluminum powder, aluminum oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride or silicon carbide. The compatabilizer is maleic anhydride graft polyolefin elastomer, acrylic anhydride graft polyolefin elastomer or silane-grafted polyolefin elastomer. The coupling agent is titanic acid ester coupling agent, silane coupling agent, aluminic acid ester coupling agent or rare earth coupling agent. The antioxidants are organic hindered phenol, amine, phosphite ester or thioester. The lubricant is stearic acid, white oil, paraffin wax, stearic acid amide, erucyl amide or polyethylene wax. An INDEPENDENT CLAIM is included for preparing the composite material comprising mixing coupling agent and nano filler to obtain mixture, performing surface treatment to the mixture, then heat drying the mixture, adding compatibilizer, antioxidant and lubricant with the mixture in a high-speed mixer, mixing at room temperature and rotating speed of 600-1000 revolutions per minute (rpm) for 15-30 minutes, adding obtained mixture into a double-screw extruder, extruding at temperature 170-230 degrees C and a screw rotating speed of 150-250 rpm, cooling to obtain particle, adding the particle and polypropylene into the high speed mixer to mix at the rotating speed of 600-1200 rpm for 15 minutes, and adding the mixture into the double-screw extruder for extruding at the temperature of 170-230 degrees C and screw rotating speed of 150-250 rpm.