TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Arrangement: The catalyst layer has a catalyst sub-layer (11a) containing catalyst for synthesizing olefin-containing gas from methanol and/or dimethyl ether, in front stage. The catalyst layer further has a catalyst sub-layer (11b) containing catalyst for hydrogenating olefin-containing gas used for producing paraffin, in later stage. The catalyst layer further has a catalyst sub-layer (A) containing a zeolite catalyst component and olefin hydrogenating catalyst for isomerizing and hydrogenating olefin, in middle stage.Preferred Method: A source gas containing methanol and/or dimethyl ether, and hydrogen, is circulated in catalyst layer (11a). An olefin-containing gas containing propylene or butene, hydrogen and water is manufactured. The obtained reactive gas is passed to catalyst layer (A), and olefin-containing gas is isomerized and hydrogenated to manufacture paraffin containing propane or butane, and hydrogen. The obtained reactive gas is passed to catalyst layer (11b), and olefin-containing gas is hydrogenated to manufacture liquefied petroleum gas containing propane or butane. Ethylene-containing material of olefin-containing gas produced after passing through catalyst layer (11a), is removed and recycled as raw material for manufacturing olefin-containing gas.Preferred Composition: The content of propane in liquefied petroleum gas is 50-100% by carbon standard. The content of sum total of propane and butane in liquefied petroleum gas is 90-100% by carbon standard. EXAMPLE - A source gas containing methanol (50 mol%) and hydrogen (50 mol%) was passed to reactor (11) having a catalyst layer containing H-ZSM-5 (catalyst having silicon and aluminum in atomic ratio of 25) (73.5 wt.%). An olefin-containing gas containing propylene or butene, hydrogen and water was produced. The obtained gas was passed through another catalyst layer containing hydrogenating catalyst (2 wt.%). The temperature of reactor was set to 330degreesC, and the maximum temperature of catalyst layer was 375degreesC. A liquefied petroleum gas containing 64% of propane by carbon standard, and 66% of sum total of propane and butane by carbon standard, was manufactured.