Eight　ultra-high　performance　concrete　T-beams　subjected　to　bending　were　tested　to　investigate　their　cracking　moments　and　cracking　characteristics　and　evaluate　the　formulas　for　cracking　moment　and　crack　width　specified　in　existing　design　codes.　The　test　results　show　that　the　degree　of　prestress　has　a　great　impact　on　the　cracking　moment;　the　bending　cracks　are　dense　and　fine,　the　development　of　the　maximum　crack　width　is　slow　at　the　early　stage　of　loading　and　speeds　up　remarkably　when　the　reinforcements　reach　to　yield　strength.　Predicating　the　cracking　moment　and　maximum　crack　width　by　existing　code　formulas　will　lead　to　overly　conservative　results.　The　modified　formulas　of　cracking　moment　and　crack　width　are　suggested　for　ultra-high　performance　concrete　beams　by　introducing　the　anti-cracking　effect　coefficient　and　crack-correction　coefficient　respectively,　and　the　calculated　values　by　the　suggested　formulas　agree　well　with　the　test　results.