The invention relates to a hard supporting member made of a hose and a rope, which consists of the hose, the rope, a hose seat board, and an injection and discharge valve arranged on the hose; a plurality of hard supporting members made of the hose and the rope are connected according to a designed temporary building model, simultaneously, liquid or gas in the hose is completely discharged and the hose is folded after being changed into soft state so as to provide a temporary building which has small volume, light weight, and convenient storage and transportation. When the temporary building needs to be built, the liquid or gas is injected into the hose through the injection and discharge valve on the hard supporting member made of the hose and the rope of the temporary building; and when all the hoses are filled with the liquid or gas, all the hard supporting members made of the hose and the rope are changed into hard supporting member state from the original soft state, and the whole temporary building is molded according to the connected model for use.