Abstract: The Jiandingshan celestite deposit is located in the northwestern margin of the Qaidam Basin. The orebodies are mainly situated with layered, layered, lenticular shapes in calcareous mudstone containing carbon and limestone from the upper member of Pliocene Shizigou group. Orebody is mainly composed of native celestite, with high grade and good spatial continuity. Ore-bearing sandstone has lower ΣREE value with an average value of 42.73×10^-6, its LREE/HREE ratio is 6.48, and δEu (0.94) and δCe (0.98) slightly negative anomaly. La/Yb-REE Plots denote that the ore-forming materials were derived from multiple sources with a main contribution from sedimentary rocks. The fluids for celestine formation might be derived from underground brine and peripheral continental basin. In summary, it's believed that this deposit may be had the characteristics of terrestrial detrital chemical deposition.