Efficient and economical desulfurization is the key to realize the comprehensive utilization of desulfurization gyp sum through the chemical circulation of calcium oxide and the acidification from flue gas.The effects of carbon content，Fe2O3 content and temperature on gypsum decomposition and In view of the characteristics of celestite ore in Qinghai and the market characteristics of high purity strontium sul fate，the key problems of production key technologies and supporting technologies，a technological plan with pertinence，pro gressiveness and industrialization production was put forward.The process of producing high purity strontium sulfate from ce lestite ore by carbon reduction was put forward emphatically.The optimum technological conditions were determined by single factor test as follows：the calcination temperature was 1 200 ℃，the mass ratio of celestite concentrate to coal powder was 5∶1，the leaching temperature of strontium sulfide was 90 ℃ and the mass ratio of Sr（OH）2 solution to H2SO4 was 1∶1.1.Under the conditions，the average yield of high purity SrSO4 was 95.53%.The SrSO4 product by experiment was white and its purity was 99.3%.All indexes met the requirements of chemical purity.