A method for decolorizing a cotton fabric, the method comprising: irradiating a laser beam onto a surface region of a cotton fabric which is dyed, to burn the surface region; exposing the cotton fabric to an ozone gas having an ozone concentration of at least 40g/m 3 for at least 15 min. to oxidize at least the surface region that was irradiated with the laser beam; spraying, by a spray machine, water onto at least the surface region oxidized by the ozone gas, to wet the surface region of the cotton fabric in the range of 50 - 100%-wet pick; and agitating, without dipping the cotton fabric into water or any other liquids or without exposing the cotton fabric to a flow of water or chemical liquid, the cotton fabric given together with pieces of artificial stones having uneven surfaces and pieces of artificial scourers including artificial fibers of a polymer containing aluminum oxide to allow the surface region to be shaved by the pieces of artificial stones and the pieces of artificial scourers, wherein the pieces of artificial stones are greater in hardness and mass-per-volume than the cotton fabric, and the pieces of artificial scourers are greater in hardness and elasticity of fiber than the cotton fabric, and wherein the pieces of artificial stones are greater by at least two times in total weight than the cotton fabric and the one or more abrasives of artificial fibers are smaller by at least two times in total weight than the artificial scourers; drying the cotton fabric in air after agitating the cotton fabric; drying the cotton fabric in an ozone atmosphere after drying the cotton fabric in air; and softening the cotton fabric with a softener. irradiating a laser beam onto a surface region of a cotton fabric which is dyed, to burn the surface region; exposing the cotton fabric to an ozone gas having an ozone concentration of at least 40g/m 3 for at least 15 min. to oxidize at least the surface region that was irradiated with the laser beam; spraying, by a spray machine, water onto at least the surface region oxidized by the ozone gas, to wet the surface region of the cotton fabric in the range of 50 - 100%-wet pick; and agitating, without dipping the cotton fabric into water or any other liquids or without exposing the cotton fabric to a flow of water or chemical liquid, the cotton fabric given together with pieces of artificial stones having uneven surfaces and pieces of artificial scourers including artificial fibers of a polymer containing aluminum oxide to allow the surface region to be shaved by the pieces of artificial stones and the pieces of artificial scourers, wherein the pieces of artificial stones are greater in hardness and mass-per-volume than the cotton fabric, and the pieces of artificial scourers are greater in hardness and elasticity of fiber than the cotton fabric, and wherein the pieces of artificial stones are greater by at least two times in total weight than the cotton fabric and the one or more abrasives of artificial fibers are smaller by at least two times in total weight than the artificial scourers; drying the cotton fabric in air after agitating the cotton fabric; drying the cotton fabric in an ozone atmosphere after drying the cotton fabric in air; and softening the cotton fabric with a softener.