A　nonlinear　finite-element　program　has　been　established　based　on　prestressed　steel-concrete　beam　to　simulate　static　behaviors　through　all　the　loading　range　including　prestressing　stage　and　loading　stage　with　its　perfect　functions.　The　material　nonlinearity　and　geometrical　nonlinearity　are　considered　and　the　shear　connectors　are　modeled　in　the　program,　the　static　behaviors　such　as　the　increment　of　prestress,　the　slip　at　the　interface,　the　ultimate　flexural　strength　are　predicted　and　analyzed　by　the　program.　Tests　are　carried　out　to　testify　the　program.