Despite　the　popularity　of　precast　concrete　(PC)　composite　beams　in　urban　construction,　some　shortcomings　still　exist　in　application.　These　include　easy　cracking,　poor　deformation　ability,　susceptibility　to　impact　damage.　To　solve　the　above　problems,　engineered　cementitious　composites　(ECC)　are　applied　in　the　tension　zone　of　PC　beam　specimens　to　improve　the　mechanical　properties.　Eleven　specimens　are　designed　and　loaded.　An　analysis　of　the　bending　behavior　is　presented　considering　the　effects　of　the　precast　ECC　plate　thickness,　reinforcement　connection　mode,　and　reinforcement　ratio　on　the　bending　performance.　The　mechanical　characteristics　of　each　stage　are　analyzed　in　detail.　The　crack　width　development　trend　is　measured.　Results　show　that　the　bearing　capacity　and　ductility　of　the　PC　beams　with　precast　ECC　plates　and　post-pouring　zones　are　higher　than　those　of　reinforced　concrete　(RC)　beams;　The　calculation　method　given　in　this　paper　can　reflect　the　mechanical　performance　well.　The　reinforcement　stress　can　be　effectively　transmitted　by　a　sleeve　or　hoop　connection;　the　precast　ECC　plate　can　effectively　control　the　crack　width.　The　PC　beam　with　ECC　baseplate　and　post　pouring　area　presented　in　this　paper　has　good　mechanical　performance　and　is　suitable　for　engineering　construction.