Abstract: Copper-molybdenum deposit in the southern Huoluotai AreaⅠare located on the iron,copper,gold,molybdenum and tungsten metallogenic zone(belt) sitting in the central north section of Greater Khingan Mountains.The metallogenic stages are divided into 4 phases in time:stageⅠis magnetite-quartz-potassium feldspar stage,stage Ⅱ is quartz-molybdenite,stageⅢis quartz-polymetallic sulfide,and stage Ⅳ is quartz-fluorite-calcite.Quartz-molybdenite stage and quartz-polymetallic sulfide stage are the main metallogenic stages.The fluid inclusions are mainly composed of CO2bearing 3phase inclusion(C type),submineralbearing inclusion（S type），gas-rich inclusion（V type），and liquidrich inclusions（L type）.Oreforming fluids generally belong to high salinity H2O-NaCl-CO2 system.The molybdenite in the deposit mainly develops in the potassium silicification zone,and was formed in the early stage of high temperature and high salinity fluid environment; polymetallic sulfide like chalcopyrite mainly develops in the sericitization zone,and was formed in the medium temperature liquidrich fluid environment.Molybdenite precipitation is mainly related to boiling and temperature reduction,polymetallic sulfide precipitation like chalcopyrite is mainly caused by temperature reduction and atmospheric water mixing.Comprehensive analysis thinks the copper-molybdenum deposit in the southern Huoluotai AreaⅠis a typical porphyry deposit.