Abstract: The effects of materials,solvent type,catalysts,ratio of liquid to solid,temperature,atmosphere,pressure,reaction time,residence time and heating rate in the process of biomass liquefaction in solvent on the liquefaction were reviewed.And kinds of refining technologies of the production mainly included catalytic hydrotreatment,catalytic crack,catalytic esterification,materials-addition,emulsification and hydrogen production by reforming and extraction were analyzed.The purpose of this research was to offer more information for the large-scale application of biomass and bio-oil.