Abstract: on the basis of type-vitrinite,authors think that perhydrous vitrinites(fluorescent vitrinite) should be considered discounted rich-hydrogen maceral(liptinite) and this is suggested that using "abundance of fluorescent) macerals-FMT)" may be as quantitative index of hydrocarbon generation and expulsion of coals in different type-reductibility.Marks of coal petrology,parameters of organic geochemistry and yield-oil of thermal simulated experiment are provided evidence for availability of "FMT" evaluation method.