TiB2/7055　composites　with　volume　fractions　of　0,　5.17　and　18.23%　were　prepared　by　two　step　method.　Firstly,　the　Al/TiB2　master　alloy　was　prepared　by　Melt　Self-propagating　High-temperature　Synthesis　method.　Then,　TiB2/7055　composite　was　prepared　by　adjusting　the　alloy　elements　with　using　this　master　alloy　as　the　matrix.　Meanwhile,　the　effect　of　TiB2　particle　content　on　hardness　and　wear　resistance　of　the　composites　were　studied.　The　microstructure　of　the　composite　was　observed　by　SEM　and　TEM.　The　result　showed　that　the　average　size　of　TiB2　reinforced　particles　were　less　than　1　mu　m　and　the　particles　were　dispersively　distributed　in　the　grain.　With　the　increasing　of　the　TiB2　particles　content,　the　hardness　and　wear　resistance　of　composites　increased.　When　the　volume　fraction　of　TiB2　was　18.23%,　the　hardness　of　composite　after　T6　aging　could　reach　to　264HB,　which　is　14.29%　higher　than　7055　alloy　(T6　aging),　and　the　wear　resistance　is　32.36%　higher　than　that　of　the　7055　alloy.