Stainless　steel　fibers　(SSFs)　were　added　into　reactive　powder　concrete　(RPC)　to　fabricate　aligned　(improved　by　Lshaped　device)　and　random　directional　distributed　SSFs　conductive　RPC.　The　aspect　ratio　of　SSFs　ranged　from　30　to　150,　while　the　SSFs　amount　was　0.2%?1.2%　by　volume　of　RPC.　Curing　ages　for　RPC　ranged　from　7　d　to　60　d.　The　conductive　performances　(electrical　resistance　and　AC　impedance　spectroscopy),　the　speed　of　ultrasonic　passing　through　specimens　and　the　following　piezoresistivity　were　investigated.　Moreover,　the　compressive　strength,　flexural　strength　and　toughness　of　specimens　cured　for　60　d　were　tested.　Finally,　high-resolution　images　of　SSFs?　dispersion　and　orientation　were　gained.　Results　showed　that　the　ultrasonic　velocity　and　electrical　resistance　of　SSFs-RPC　grew　in　the　form　of　a　quadratic　function　with　the　increasing　curing　ages.　The　SSFs　content　of　0.4%　was　the　percolation　threshold　value　of　SSFs-RPC.　Additionally,　RPC　with　higher　aspect　ratio　and　aligned　fibers　performed　better　conductivity,　piezoresistivity　and　mechanical　performance.　The　conductive　mechanism　of　SSFs-RPC　can　be　explained　through　the　conduction　models　of　three　series　connected　electrical　components.　The　image　analysis　showed　that　SSFs　with　higher　aspect　ratio　dispersed　more　uniformly　in　RPC　and　the　L-shaped　device　could　effectively　improve　the　alignment　of　fibers.