Control method for laundry treatment apparatus

A control method for a laundry treatment apparatus, which includes a first reservoir configured to hold water and defining a first opening to receive laundry therethrough, a second reservoir placed inside the first reservoir and defining a second opening, and a pulsator rotatably provided inside the second reservoir, includes supplying water to the first reservoir and performing primary washing of the first and second reservoirs by rotating at least one of the pulsator or the second reservoir. The primary washing step includes performing a first motion by rotating the pulsator to produce a water stream inside the first and second reservoirs, and performing a second motion by rotating the second reservoir to cause water to move upward along a space between an inner circumferential surface of the first reservoir and an outer circumferential surface of the second reservoir and then be introduced into the second reservoir through the second opening.