Two　different　types　sulfuric　acids,　i.e.　the　biological　sulfuric　acid　(BSA)　produced　by　T.t　bacteria　(Thiobacillus　thiooxidans)　and　chemical　sulfuric　acid　(CSA),　were　applied　to　simulate　the　corrosion.　The　sulphoaluminate　cement　(SAC)　and　the　sea　sand　were　mixed　to　made　the　concrete.　The　mass　loss,　compressive　strength,　chloride　binding　rate,　pH　value　and　pore　structure　were　measured　in　the　process　of　corrosion.　Furthermore,　X-ray　diffraction　(XRD)　and　scanning　electron　microscopy-energy　dispersive　spectroscopy　(SEM-EDS)　were　used　to　analyze　the　products　of　the　reaction.　It　could　be　found　that　under　the　corrosion　of　sulfuric　acid,　the　initial　hydration　products　of　SAC,　including　ettringite　(AFt)　and　Friedels＇　salt,　were　decomposed　continuously　and　the　main　corrosion　product　was　dihydrate　gypsum.　Under　corrosion　of　BSA,　the　corrosion　became　more　intense　due　to　the　influence　of　bacterial　effect.　Moreover,　the　corrosion　of　BSA　was　more　severe　than　that　of　CSA,　which　was　obvious　in　terms　of　mass　loss,　strength　decline　and　pore　structure.　The　BSA　has　a　more　negative　effect　on　the　performance　of　SAC　concrete.　(C)　2017　Published　by　Elsevier　Ltd.