With　the　advancement　and　development　of　society,　the　energy　saving　and　emission　reduction　project　in　the　enterprise　is　highlighted　for　special　attention.　It　is　not　only　the　objective　requirement　of　building　a　resource-conserving　and　environment-friendly　society,　but　also　the　inevitable　choice　of　enhancing　the　competition　ability　of　enterprise　and　developing　the　economic　of　enterprise.　The　paper　builds　the　enterprise＇s　energy　saving　and　emission　reduction　model　based　on　the　theory　and　method　of　the　system　dynamics.　And　using　computer　simulations　for　the　Analysis　of　the　energy　saving　and　emission　reduction　efforts　in　the　jobbing　foundry.