Abstract: Strontium carbonate was prepared from lapis lazuli by using carbon reduction method.The influences of the amount-of-substance ratio，roasting temperature，roasting time，mass ratio of solid to liquid，and leaching time etc.on the utilization ratio of strontium were investigated.The optimal strontium recovery was determined by orthogonal experiment，i.e. amount-of-substance ratio of lapis lazuli to coal was 5.7∶1，roasting temperature was 1 150 ℃，roasting time was 40 min，mass ratio of solid to liquid was 1∶14，and leaching time was 2.2 h.The study can provide a reference for raising the utilization of strontium resources.

Key words: carbon reduction method, lapis lazuli, strontium carbonate, orthogonal test