The microstructure,tensilc property and wear resistance of 7075 aluminum matrix composite reinforced with TiC particles prepared by in-situ reaction casting were investigated.The effect of TiC reinforcement on wear behavior was analyzed.The wear mechanism was also discussed.A micro-mechanism model of reaction kinetics for synthesis of TiC was acquired.Results show that TiC could increase the tensile and yield strength,but decrease the elongation.Besides,TiC particles improve the property of wear resistance of 7075 aluminum alloy.The wear mechanisms include abrasive wear and adhesive wear in wear test process.