Abstract: The limestone mine for flux in the Nali mining area of Pingguang Forest Farm in Shangsi County is located in the west of the Shiwanda Mountain compound syncline and in the north of the Shangsi Basin. By analyzing the mining area geology，ore body geology，ore controlling factors，etc.，the geological characteristics of the ore deposit and the genesis of the ore deposit are summarized. Three limestone ore bodies are delineated in the mining area，the ore bodies are large in scale and stable in thickness. The de⁃ posit is mainly formed in the isolated platform in the Early-middle Permian rift basin. The strata of Maokou Formation deposited during this period are limestone deposits. The distribution of ore bodies is mainly con⁃ trolled by strata，and secondary folds and faults cause stratigraphic duplication and deletion.

Key words: limestone mine, deposit geology, ore genesis