TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The active material is ammonium molybdate, ammonium tungstate, ferric nitrate, nickel nitrate, cobalt nitrate, nickel sulfate, cobaltous sulfate, ferric sulfate, or ferrous sulfate.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Method: The method comprises using ideal hydrogen carrier as circulated solvent; and separating and purifying dried gas to obtain combustible gas and non-flammable gas. The pyrolysis, dissolving and hydrogen transferring reactions of biomass is carried out at 1.5-8.5 preferably 3.5-6 MPa and 250-430 preferably 350-400 degrees C for 5-50 preferably 15-35 minutes. The reactor is upflow type fluidized reactor capable of reacting continuously, such that low liquid-solid ratio raw material ratio and heated hydrogen supplying solvent are fed, and that reacting product is discharged from top of reactor at weight ratio of solvent of low liquid-solid ratio raw material ratio and biomass of 0.2-1.0. It can also be stirring device with stable internal component. Preferred Component: The weight ratio of solvent and biomass raw material in reacting container is 1.5-4.2 preferably 2-3.5. The amount of catalyst is 0.1-1.0% of biomass. The catalyst takes oil soluble or water soluble compound of group IV-VI elements and group IIIB-VIII elements as active material and non-ionic surfactant as auxiliary agent, in which active material in catalyst occupies 35-55 wt.%. The auxiliary agent is polysorbate, shrinkable sorbic acid oleic acid ester, alkyl polyglycosides, ethylene oxide sorbitol anhydride oleic acid, cool ester and poly propylene oxygen poly(ethylene oxide glycerin ether). The active material is dimer acid urea complexation lanthanated, ethylenediamine tetraacetate complexation iron, glutaric acid urea complexation cobalt, or 2-ethylhexanoate urea complexation molybdenum. The original solvent is anthracene oil or aromatic hydrocarbons with less than four rings, homologue compound, and derivative including elements carbon and hydrogen.