In view of the common problems of salt deposits in China

such as thin salt layers

abundant interlayers

large variations in salt grade

and high insoluble content

this study establishes a CAES salt cavern site-selection suitability evaluation system covering regional geology

salt rock occurrence

interlayer development

caprock sealing capacity

engineering foundation

location conditions

and water resource availability.The entropy weight-TOPSIS method is adopted for quantitative evaluation.The results show that interlayer conditions

salt-layer thickness and grade

caprock sealing capacity

existing engineering foundation

location conditions

and water resource availability are the main factors affecting the suitability of salt cavern construction.The entropy‑weight TOPSIS method is adopted to analyze the Anning Salt Deposit in Kunming

and its comprehensive score

suitability grade and restricting factors are obtained.