Haolibao Deposit,located in the east of Xilamulun metallogenic belt,is a porphyry Cu-Mo deposit.Ore bodies are mainly hosted in breccia zone of plagioclase granite porphyry,and are closely related to plagiogranite porphyry.The mineralization can be pided into 3 stages:quartz-chalcopyrite-pyrite-molybdenite stage(Ⅰ);pyrite-galena-sphalerite-molybdenite-quartz vein stage(Ⅱ);quartz-calcite-fluorite stage(Ⅲ).The results of fluid inclusions test show that the fluid inclusions are mainly gas-liquid twophase inclusions (L type),CO₂containing inclusions(C type) and pure CO₂ inclusions (PC type).Stage Ⅰ mainly includes L,C and PC type fluid inclusions,which are typical high temperature (380 ℃-400 ℃) and medium-low salinity (7.5 %-8.5 %) CO₂-NaCl-H₂O system; Stage Ⅱ mainly includes L and C type fluid inclusions,belonging to high temperature (330 ℃-350 ℃) and low salinity (4.25 %-5.00 %) CO₂-NaCl-H₂O system;Stage Ⅲ only includes L type fluid inclusions,belonging to the medium-low temperature (280 ℃-300 ℃) and low salinity (2.00 %-2.75 %) NaCl-H₂O system.The results of H-O isotope test is that δDV-SMOW is-115.8 ‰--94.5 ‰，δ18OH₂O is-8.32 ‰-0.28 ‰,implying that the ore-forming fluid of the deposit is mainly from magma with a small amount of meteoric water.The results show that the ore-forming fluid of the deposit is of medium high temperature and low salinity,and the immiscibility of fluid promotes the precipitation and enrichment of metal minerals.