Combining　modern　thermodynamic　theories,　including　finite　time　thermodynamics,　constructal　theory　and　entransy　theory,　with　metallurgical　process　engineering,　a　generalized　thermodynamic　optimization　theory　for　iron　and　steel　production　processes　is　proposed.　The　simulation　platform　for　the　energy　consumption　and　emissions　of　the　iron　and　steel　production　process　is　built,　and　the　evaluation　method　of　the　material　flows,　energy　flows　and　environment　combining　exergy　analysis　with　life　cycle　assessment　is　established.　On　the　basis　of　the　new　theory,　simulation　platform　and　evaluation　method,　interaction　mechanism　investigations　for　the　material　flows,　energy　flows　and　environment　of　the　elemental　packages,　working　procedure　modules,　functional　subsystems　and　whole　process　of　the　iron　and　steel　production　processes　are　conducted,　and　multi-disciplinary　and　multi-objective　generalized　thermodynamic　optimizations　of　them　are　also　implemented.　After　optimizations,　the　selections　of　the　processes　and　technologies,　the　distributions　of　the　materials　and　energies　as　well　as　the　utilizations　of　the　residual　energies　and　heats　are　more　reasonable.　The　systems　of　the　whole　process　are　integrated,　and　the　material　flows,　energy　flows　and　environment　are　synthetically　coordinated.　Finally,　the　efficient　allocation　of　the　energies　and　the　cascade　utilization　of　the　residual　energies　are　realized,　and　the　energy　consumption　and　emissions　of　the　whole　system　are　significantly　decreased.　This　paper　can　provide　theoretical　supports　for　the　designs　and　operations　of　the　energy　and　environmental　protection　center　of　the　iron　and　steel　enterprises　by　exploring　the　efficient,　energy-saving　and　low　emission　technologies　of　the　iron　and　steel　production　processes.　It　also　can　provide　research　platforms　and　lay　science　and　technology　bases　for　solving　the　common　efficient　energy-saving　problems　of　the　general　material　transformation　processes.　©　2018,　Science　Press.　All　right　reserved.