Abstract: Through upgrading, bio-oil by biomass fast pyrolysis is promising technology for diesel or gasoline substitute. Biomass to bio-oil is considered extensively a controllable technology with a fast progress. But the upgrading or refinery of bio-oil is complex. The paper summarized recent development of the technology of bio-oil upgrading or refinery, and the research way of aqueous of bio-oil for hydrogen and the unaqueous for oil is a promising scheme，and some suggestion for using bio-oil by classification is put forward.