Abstract: A method for stabilizing a cloth comprises a moisture controlling step S1 of adding water to the cloth and a thermal pressing step S2 of thermally pressing the water-added cloth. The water added in the moisture controlling step is vaporized to cover up the entire cloth and therefore the cloth can be heated uniformly. When temperature of the cloth increases, the moisture works as a lubricant, enabling to release internal stress of the cloth efficiently. By thermally pressing, a structure of the cloth under the heated state is fixed by the pressure applied in the pressing operation, making possible to stabilize the cloth while preventing excessive shrinkage of the cloth and increasing smoothness of cloth surfaces.