A method for controlling a spinning stroke of a washing machine is disclosed. The method for controlling a spinning stroke of a washing machine comprises steps of: judging a first value of the laundry amount based on a frequency of water re-supply counted in a rinsing stroke; measuring the time taken for a drum rotating before a spinning stroke to reach a preset speed once a rinsing stroke is completed; judging a second value of the laundry amount based on the measured time; determining a final value of the laundry amount based on the first and second value of the laundry amount; and starting a spinning stroke based on the spinning condition determined based on the final value of the laundry amount. An object of the present invention is to provide a method for controlling a spinning stroke of a washing machine, in which the laundry amount is sensed more accurately in a spinning stroke.