NOVELTY - Process for transforming farming and forestry waste and domestic garbage into gasoline, comprises mixing organic matters and biomass raw materials in the domestic garbage; material undergoes dehydration and decomposition; gasifying entrained-flow gasifier, cleaning; entered into several slurry-bed three-phase reactors; catalysts are poured out from the reactor, kept warm and concentrated, distilled, and burned out carbon deposit, reduced and re-produced; catalyzing; performs dehydration, then re-forming with catalyst, and entered into high-pressure condenser, crude gasoline and gas.    USE - The process is useful for transforming farming and forestry waste and domestic garbage into gasoline (claimed).    DETAILED DESCRIPTION - Process for transforming farming and forestry waste and domestic garbage into gasoline, where organic combustible matters having light density and inorganic combustible matters having large density are separated from the domestic garbage by sieving and winnowing; solid phase is comprised of catalyst combination with different functions; where there are two or more catalysts with composite alcohols, namely methanol composite catalyst and low-carbon mixed alcohol composite catalyst and alcohol dehydration catalyst which are mixed according to certain proportion to compose a multifunctional catalyzing system with a carbon monoxide transformation function, a low-carbon alcohol composite function and a function for generating mixed ester or hydrocarbon by low-carbon alcohol dehydration. INDEPENDENT CLAIMS are also included for:    (1) the process for preparing composite gas by biomass material with two-step method;    (2) a gasifier of composite gas prepared by the combustible and biomass in the domestic garbage comprises upper and lower furnace; two furnaces have connection with each other, the middle part is separated by a layered furnace, the furnace body is two vertical concentric columns prepared by rolling welding the steel slab, the outer wall of the outer ring is covered with a layer of temperature preserving material of which the thickness is 50-500 mm, between two rings are a steam boiler; the inner wall of the inner ring is layered with fire-proof material of which the thickness is 30-90 mm, column space of the fire-proof material is the hearth, vertical middle part in the hearth (one meter higher or lower than the middle line) is a horizontally layered furnace shelter, the upper part of the furnace shelter is the upper furnace and the lower part is the lower furnace; the oxygen wind supply outlet of the upper furnace is distributed on the furnace body circle on the upper part of the furnace shelter, the wind outlet is 0.1-1.2 m from the furnace shelter, the number of the wind outlet is 2-12 evenly distributed on the same plane or upper and lower staggered with evenly space; the center line of the wind pipe has the 0-30 degree inclination with the horizontal clamp, and the wind pipe can blow the oxygen to the furnace center horizontally or up or down; the wind area is equipped with the glass observing hole cooling by water; the furnace shelter is layered with a layer of fire-proof material with thickness of 30-90mm in the seamless steel pipe with thickness of 6-18 mm; the steel pipe is welded on the inner ring of the furnace body and two ends have the connection with the boiler; the furnace body circle in the lower part of the furnace shelter is distributed with 2-8 nozzles of pulverized coal and oxygen; the nozzles are 0.1-0.8 m from the furnace shelter, or can be evenly distributed on one plane or upper and lower staggered with evenly space; the oxygen coal gun is inserted in the nozzle; the gun can be horizontally installed or a little up or down tilting, the central line of the gun has 0-30 degrees inclination with the horizontal line, the oxygen coal gun is the two bush pipes structure, the inner pipe sprays the oxygen, the space between two rings sprays the pulverized coal, and the inner pipe of the outlet is a little longer for avoiding the oxygen from backward flowing to the coal pipe; and the added vapor is added to the oxygen; the bottom of the cavity of lower furnace is the common outlet of the gasification products, the upper contraction angle is 100-160 degrees ; the end cover is double-layered, and the upper layer is reversed cone-shaped, the lower layer is circular in horizontal arrangement, the upper surface and surface of the central nozzle are coated with a layer of refractory materials of a thickness of 30-190 mm; the lower part of the central nozzle is provided with an expanded guiding cylinder; the inner end of outlet of the composite gas is the upper part of external cycle of the guiding cylinder; the quenching and precipitation pot and the lower end of the salvaging propeller are configured under the ground; the refractory materials is high aluminum clay containing a aluminum oxide greater than or equal to 80%, refractory concrete containing a aluminum oxide greater than or equal to 80%, refractory concrete containing chromium, corundum and silicon carbide; the working characters of the furnace comprises, the upper furnace is a fixed bed (movable bed) gasification furnace, the combustibles of domestic garbage and the materials of biomass are gasified on the upper furnace, the oxygen gas (containing oxygen of 80-100%) is taken as gasification medium; the products gasified in the upper furnace are introduced in the lower furnace for secondary reaction; the lower furnace is an air flow bed furnace, the gasified products, fine coal, oxygen gas and water vapor are taken as the gasification materials to carry out high-temperature (1600-2000 degrees C) reaction. By regulating the feeding amount of fine coal in lower furnace, controlling the ratio of oxygen gas to coal be 0.7-1.2kg/1kg, and adding water vapor with a ratio of it to coal of 0-0.2kg/1kg, the gasification temperature in the lower furnace can be controlled, so far as the temperature of the outlet is greater than or equal to 16000 degrees C; pressure in lower furnace is slightly less than that in upper furnace; a water cooling wall structure is applied and only one thin layer of refractory materials is coated on the portion of fire box facing fire, the dregs is attached to the refractory materials and for resisting dregs and protecting wall, the boiler generates low-pressure vapor for use of gasification furnace, steel furnace only sustains water temperature (120-220 degrees C) and low pressure (50 pa-100kpa); the gasified products ejected from the cavity of furnace passes through an inertia ash-removal device consisting of guiding cylinder and boiler, the gas to discharged out of furnace processes ash-removal and cooling before being discharged out of furnace; and    (3) a fully-dry three-step ash-removal, poison-elimination, and purification process for producing gas from domestic garbage.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram for transforming farming and forestry waste and domestic garbage into gasoline.