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.