Uniaxial　compression　tests　were　performed　on　the　steel　fiber　reinforced　concrete　(SFRC)　specimens　with　different　ages　and　steel　fiber　volume　fractions.　The　acoustic　emission　(AE)　and　microseismic　(MS)　signals　were　monitored　during　the　loading　progress.　Through　the　in-depth　analysis　of　testing　results,　the　feature　of　AE　and　MS　signals　and　the　evolution　of　crack　propagation　in　SFRC　were　studied.　The　results　show　that:　(1)　The　crack　propagation　of　SFRC　during　uniaxial　compression　can　be　divided　into　four　stages:　Crack　compaction　stage　(I),　crack　stable　development　stage　(II),　crack　unstable　propagation　stage　(III)　and　post-peak　failure　stage　(IV).　Different　stages　show　different　AE　and　MS　characteristics.　(2)　With　the　increase　of　age,　the　energy　rates　and　count　rates　of　AE　and　MS　in　stages　I　and　II　decrease,　as　well　as　the　generation　rates　of　micro-,　meso-　and　macro-　cracks　of　the　whole　specimen.　However,　the　energy　rate　and　count　rate　of　AE　and　MS　in　stages　III　and　IV　increase,　as　well　as　the　generation　rates　of　micro-,　meso-　and　macro-cracks　of　the　whole　specimen　increase.　(3)　With　the　increase　of　steel　fiber　volume　fraction,　the　AE　energy　rate,　AE　count　rate　and　micro-crack　generation　rate　of　the　whole　specimen　in　stages　II,　III　and　IV　increase,　while　the　MS　energy　rate　and　MS　count　rate　in　each　stage　decrease,　and　the　MS　energy　surge　time　rate　in　each　stage　increase.　Furthermore,　the　generation　rates　of　meso-　and　macro-　cracks　of　the　whole　specimen　in　each　stage　decrease,　and　the　failure　time　is　delayed.　(4)　Before　the　failure　of　SFRC,　the　energy　rates　and　count　rates　of　AE　and　MS　increase　sharply,　as　well　as　MS　energy　ratio.　These　variables　can　be　used　as　the　precursor　index　of　SFRC　failure.　©　2023　Beijing　University　of　Aeronautics　and　Astronautics　(BUAA).　All　rights　reserved.