The　flue　gas　produced　by　non-ferrous　metal　smelting　seriously　pollutes　the　ecological　environment.　Sulfur　dioxide　in　the　smelting　flue　gas　has　a　high　concentration　and　a　wide　range　of　variation.　The　recovery　of　sulfur　dioxide　to　produce　acid　is　currently　the　most　widely　used　desulfurization　method.　Acid　production　with　smelting　flue　gas　was　taken　as　the　main　research　object,　and　its　technology　and　control　process　were　analyzed.　First,　the　development　history　of　acid　production　with　smelting　flue　gas　at　home　and　abroad　was　briefly　reviewed.　Second,　the　existing　flue　gas　desulfurization　methods　were　reviewed,　and　the　process　of　acid　production　with　flue　gas　and　its　development　status　were　mainly　analyzed.　Finally,　combined　with　the　research　status　of　modeling,　optimization,　and　control　of　the　system　of　acid　production　with　flue　gas　in　recent　years,　the　development　prospects　and　difficulties　in　the　process　of　optimal　control　algorithm　application　were　analyzed　and　discussed.　©　2023　Beijing　University　of　Technology.　All　rights　reserved.