Sulfation　of　alkali　chlorides　has　significant　effects　on　relieving　deposition　and　corrosion　in　the　heat　exchanging　surfaces　during　combustion　of　fuels　abundant　in　alkali　and　chloride.　This　paper　studies　the　effects　of　sulfation　temperature　and　reactants　concentration　on　the　sulfation　of　condensed　sodium　chloride　in　a　fixed　bed　reactor.　Results　showed　that　only　Na2SO4　was　found　in　the　products.　The　sulfation　ratio　for　variation　of　temperature　in　523-1023　K　was　divided　into　two　stages,　first　almost　no　change　below　773　K　and　exponential　increase　with　temperature　further　increasing.　It　indicated　a　different　sulfation　mechanism　existed　between　low　and　high　temperatures,　which　was　further　validated　by　the　kinetic　analysis　of　the　sulfation　and　results　of　the　effects　of　reactant　concentrations.　The　difference　on　the　sulfation　mechanism　was　mainly　due　to　the　formation　of　a　eutectic　of　NaCl-Na2SO4　mixture　at　high　temperatures,　which　was　further　confirmed　by　the　results　of　scanning　electron　microscopy.　The　sulfation　reaction　rate　of　condensed　NaCl　at　823-1023　K　is　described　by　the　expression　dX/dt　=　0.218　exp(-10,320/T)　(1　-　X)(2/3)(C-O2)(0.58)(C-SO2)(0.85)(H2O)(1.87)