Firstly,　different　concrete　beams　reinforced　by　basalt　fibers,　polypropylene　fibers,　hybrid　fibers　and　silica　fume　were　experimentally　tested　for　their　cracking　moments.　The　plastic　deformation　development　coefficient　k　of　each　concrete　beam　was　calculated　based　on　the　tested　cracking　moments　and　the　measured　material　properties.　Then　the　stress　distributions　of　the　tensile　concrete　subjected　to　cracking　were　described.　After　that,　the　plastic　influence　coefficient　of　the　cross-section　resistance　moment　corresponding　to　each　beam　could　also　be　calculated　using　k.　Lastly,　the　cracking　moment　formulas　for　basalt　or　polypropylene　fiber　reinforced　concrete　beams　were　deduced　based　on　the　plastic　influence　coefficient.　The　analysis　results　indicate　that　the　plane　cross-section　assumption　is　basically　satisfied　for　fiber　reinforced　concrete　beams.　The　addition　of　fibers　and　silica　fume　increased　the　cracking　moments　of　the　concrete　beams.　The　basalt　fibers　show　better　performance　than　polypropylene　fibers　under　an　identical　volume　fraction.　Moreover,　the　coefficient　k　provides　a　reference　for　the　theoretical　deduction　of　the　cracking　moments　of　fiber　reinforced　concrete　beams.　It　can　be　used　as　an　index　to　evaluate　the　plastic　deformation　ability　of　tensile　concrete　subjected　to　cracking.　The　splitting　tensile　strengths,　as　well　as　the　plastic　deformation　ability　of　tensile　concrete,　affect　the　cracking　moments　of　concrete　beams.　The　proposed　formula　for　the　cracking　moments　of　basalt　or　polypropylene　fiber　reinforced　concrete　beams　can　be　used　as　reference　for　relevant　calculation.　©　2019,　Editorial　Department　of　Journal　of　Building　Materials.　All　right　reserved.