A　flexural　test　was　conducted　to　investigate　the　effectiveness　of　a　new　type　of　hybrid　fibers　reinforced　reactive　powder　concrete(RPC),　in　which　RPC　was　reinforced　with　a　combination　of　steel　fibers　and　macro-polyolefin(PP)　or　micro-polyvinyl　alcohol(PVA)　fibers　in　different　quantities,　to　improve　the　toughness　and　brittleness　performances　of　beams.　Influences　of　different　types　and　quantity　of　fiber　on　the　toughness　of　RPC　were　compared　with　the　specimens　in　which　either　ultra-fine　cement　or　silica　fume　was　used.　It　is　observed　from　the　results　of　the　experiment　that　the　＇secondary　peak＇　characteristics　of　the　load-deflection　curves　are　achieved,　which　are　far　much　better　than　only　using　steel　fibers　in　RPC.　The　toughness　index　is　more　significantly　improved　when　steel　fibers　and　PP　or　PVA　fibers　are　used　together　in　RPC　than　that　in　which　only　steel　fiber　is　used.　It　is　also　observed　that　better　results　are　achieved　for　ultra-fine　cement　RPC　specimens　blended　with　1%　volume　fraction　steel　fiber　and　9kg/m3　PP　fibers　as　compared　with　specimens　blended　with　1%　steel　fibers　only,　where　the　toughness　index　is　significantly　improved　by　70%,　and　that　the　most　economical　configuration　of　fibers　is　that　in　which　RPC　is　blended　with　1%　volume　fraction　steel　fibers　and　PP　or　PVA　fibers.　When　steel　fiber　volume　fraction　is　2%,　it　is　advisable　that　the　amount　of　micro-PVA　fibers　should　not　exceed　9kg/m3;　the　toughness　of　ultra-fine　cement　RPC　is　better　than　that　of　silica　fume　RPC.　©,　2015,　Tongji　University.　All　right　reserved.