There are bitumen in the native copper ores hosted by the Emeishan Basalt and carbonaceous material inthe native copper ores hosted by sedimentary rocks between basalt layers in the district of northeastern Yunnanand western Guizhou．The contents of the chloroform bitumen “A ’’extracted from the organic matter in thesetwo types of copper ores and the saturates，aromatics， resins and asphaltenes in it are quantified and thebiomarkers of the saturates are studied by chloroform extraction method and GSM S， and their geologicalsignificances are discussed． The conclusions are： (1) There are no obvious differences in the contents ofchloroform bitumen “A ” and saturates，aromatics。resins and asphaltenes and the features of biomarkersbetween the two types of copper ores though their occurrences and genesis are different，which implies that theysuffered similar geological events． (2) The confusion of the genetic information supplied by the organiccompositions and their biomarkers may be the result of the activities of the ore—forming fluid．(3)The featuresof biomarkers also suggests that the organic m atter in these copper ores experienced a salty and reducedenvironment， which maybe related to the brine—source metallogenetic fluid and reduced condition ofmineralization． (4)The features of biomarkers and the low contents of chloroform bitumen “A”show a highmaturity of the organic m atter in the copper ores， which may be caused by the heat of the ore—forminghydrothermal fluid． (5)There is no obvious biodegradation according to biomarkers．which suggests that thebitumen is from the degradation of petroleum caused by the heat of ore—form ing fluid．