NOVELTY - Refining and producing liquefied gas and tar by using fire-wood, grass, straw and other combustible materials comprises: (a) putting the recycled waste crop combustible materials into a burning furnace; (b) the materials generated in (a) are transmitted into the retaining pool via the cooling pipe; (c) the combustible mixed gas, CO2, and the un-burned rest O2 is transmitted into a de-oxidation chamber; and (d) using piston absorption method to discharge the liquefied tar and water in the retaining pool out of the pool in batches under the closed condition.    USE - Process for refining and producing liquefied gas and tar by using fire-wood, grass, straw and other combustible materials (claimed).    ADVANTAGE - The invention makes waste profitable, which uses heat energy to generate motion or vapor for generating electricity to become a new biological energy source for easing energy shortage; the production procedure is closed process and admission, which has high aerogenesis efficiency and great economic benefit; and the CO2 discharge amount is largely reduced.    DETAILED DESCRIPTION - Refining and producing liquefied gas and tar by using fire-wood, grass, straw and other combustible materials comprises: (a) putting the recycled waste crop combustible materials e.g. fire-wood, grass, straw, chaff and so on into a burning furnace from a burning furnace hopper; closing the hopper door, and burning under the sealed condition; blowing air for burning the combustible materials by using a blower; the combustible materials generated a lot of combustible mixed gas, tar, carbon dioxide (CO2), un-burned rest O2, and vapor after burning; the external part of the burning furnace body is equipped with a water containing cavity which uses the heat energy generated during burning to evaporate the water in it; the generated vapor is used for generating electrify or in other market; (b) the combustible mixed gas, tar, CO2, un-burned rest O2, and vapor generated in (a) are transmitted into the retaining pool via the cooling pipe using tap water cooling or air cooling; where tar and vapor is liquefied after cooling and retained into the retaining pool; (c) the combustible mixed gas, CO2, and the un-burned rest O2 which stay above the retaining pool is transmitted into a de-oxidation chamber, and using burning consumption method to remove the oxygen at normal temperature and under normal pressure in a closed condition; the oxygen-free mixed fuel gas which can be optionally pressed is transmitted into a combined piston to enter into a discharging device in batches to process secondary and thirdly pressurizing; transmitting the pressed gas into the storage tank under 3P atmospheric pressure; the combustible mixed gas is stored after changed into liquid from gas; using the pressure valve under the 3P atmospheric pressure to discharge the CO2 gas; packing the reserved liquid combustible mixed gas to produce the canned liquefied gas; and (d) using piston absorption method to discharge the liquefied tar and water in the retaining pool out of the pool in batches under the closed condition; processing evaporative concentration to the discharged tar and water, and recycling the tar to provide the chemical plants to refine.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of the process for refining and producing liquefied gas and tar by using fire-wood, grass, straw and other combustible materials. (Drawing shows non-English language text.)