A control method of a dish washer is provided to prevent the malfunction of instrument by discharging the foreign material existing in a steam generator before or after generating the steam. A control method of a dish washer comprises: a first step supplying the steam generated by a steam generator(300) to the tableware; a second step supplying the water to a water tank in order for the water to overflow from the water tank of the steam generator after or before the first step; and a third step guiding the water flowing out from the water tank to a sump(200) inside.
