Abstract: The paper generalized present research status of generation mechanism and influencing factors of biogenic coalbed methane, anaerobic bacteria in coal and their function on bio-methane generation, and the latest developments of stimulation experiment on biogenic coalbed methane in China and abroad. Bacteria counting and molecular ecology are main methods to study the amount and physiological characteristics of anaerobic bacteria. Organic geochemistry analysis of extract material from coal has indicated that coal could act as the substrate in methane generation. Stimulation experiment on bio-methane could read the effect characteristics of some influencing factors on biogenic coalbed methane. Studies on anaerobic bacteria in coal in China focus on the amount counting and enriched cultivation mostly, while abroad studies are mostly concentrated on molecular ecological characteristics and genetically improved strain of methanogen. The study of generation mechanism of secondary biogenic coalbed methane was emphasized, because it is not only helpful to coalbed methane exploration and development, but also plays important role in coal's secondary gas-generation.