The　strength　characteristics　of　cemented　paste　backfill　(CPB)　in　mining　areas　are　key　control　factors　for　the　safety　assessment　of　overlying　strata.　A　series　of　experiments　about　uniaxial　compression　and　triaxial　compression　were　carried　out　to　study　the　influence　of　cement　content　of　filling　slurry,　curing　age,　and　curing　temperature　on　strength　behavior　of　CPB　specimens.　The　failure　mechanism　and　damage　feature　of　CPB　have　been　investigated.　The　results　show　the　following:　(1)　The　uniaxial　compressive　strength　of　CPB　specimens　exhibits　an　upward　trend　with　the　increase　of　cement　content　and　curing　age.　When　the　cement　content　is　high,　the　uniaxial　compressive　strength　increases　sharply　with　increasing　curing　age.　(2)　The　cohesion　of　CPB　specimens　increases　with　the　increase　of　cement　content　of　filling　slurry,　curing　age,　and　curing　temperature.　The　cohesion　of　CPB　specimens　with　curing　age　7　days　and　14　days　increases　linearly　with　increasing　cement　content.　At　the　later　stage　of　curing　age,　the　strength　growth　of　high　cement　content　backfill　is　significantly　greater　than　that　of　low　cement　content.　The　internal　friction　angle　of　the　filling　increases　slightly　with　increasing　filling　cement　content,　curing　age,　and　curing　temperature.　(3)　The　shear　strength　of　CPB　specimens　at　curing　age　7　days　exhibits　an　upward　trend　with　the　increase　of　confining　pressure,　while　the　shear　strength　at　14　days　and　28　days　curing　age　decreases　slightly　as　the　confining　pressure　increases.　(4)　With　the　increase　of　cement　content　in　backfill,　the　brittleness　increases　significantly　when　the　backfill　is　damaged.　The　failure　mode　of　CPB　specimens　changes　from　monoclinic　section　shear　failure　to　X-type　failure　with　increasing　curing　age,　and　the　failure　process　is　divided　into　four　stages:　pore　compaction,　linear　elastic　deformation,　plastic　deformation,　and　post-peak　failure.