Provided is a method for treating keratinous fibers comprising: applying steam to the keratinous fibers at a rate of less than 5 g/min; and shaping the keratinous fibers at a temperature of greater than 50° C., wherein the application of the steam and the shaping of the keratinous fibers do not occur simultaneously. The method disclosed herein may make it possible for example to obtain rapid shaping of the keratinous fibers while improving their cosmetic properties and the comfort of the user.