Abstract: The Narigongma porphyry molybdenum (-copper) deposit in Southern Qinghai Province is located in the northern part of Yulong metallogenic belt. Research on the deposit recognizes three types of alteration in the orefield, i.e. K-silicate alteration (biotite-K feldspar), propylitic alteration (chlorite-epidote±calcite) and feldspar-destructive alteration (sericite±kaolin±calcite±anhydrite). The metallogenesis is closely related to the quartz-molybdenite±anhydrite±chalcopyrite±pyrite vein and molybdenite±pyrite±chalcopyrite vein.