In a control method of a washing machine, a washing operation (S50) is performed (S100, S80, S90) through a heating washing process for a first set time (T1) and is performed (S100, S80, S90) through a non-heating washing process for a residual time, and, if the heating washing process is started, the rotation of a driving motor (127, 128) is weakly controlled until a washing water temperature reaches (40) a primary target temperature, and is strongly controlled until the washing water temperature reaches (40) a secondary target temperature after the washing water temperature reaches (40) the primary target temperature, so that the washing water temperature is relatively gradually increased.
