The　cement　production　is　an　energy　intensive　industry　with　energy　typically　accounting　for　50-60%　of　the　production　costs.　In　order　to　recover　waste　heat　from　the　preheater　exhaust　and　clinker　cooler　exhaust　gases　in　cement　plant,　single　flash　steam　cycle,　dual-pressure　steam　cycle,　organic　Rankine　cycle　(ORC)　and　the　Kalina　cycle　are　used　for　cogeneration　in　cement　plant.　The　exergy　analysis　for　each　cogeneration　system　is　examined,　and　a　parameter　optimization　for　each　cogeneration　system　is　achieved　by　means　of　genetic　algorithm　(GA)　to　reach　the　maximum　exergy　efficiency.　The　optimum　performances　for　different　cogeneration　systems　are　compared　under　the　same　condition.　The　results　show　that　the　exergy　losses　in　turbine,　condenser,　and　heat　recovery　vapor　generator　are　relatively　large.　and　reducing　the　exergy　losses　of　these　components　could　improve　the　performance　of　the　cogeneration　system.　Compared　with　other　systems,　the　Kalina　cycle　could　achieve　the　best　performance　in　cement　plant.　(C)　2008　Elsevier　Ltd.　All　rights　reserved.