A washing machine and a method of controlling the same are disclosed. If two washing tubs simultaneously perform the dehydration, unbalanced positions of the first and second washing tubs are checked. The method controls dehydration rotation speed or dehydration rotation direction of each washing tub to adjust a difference in unbalanced position angle between two washing tubs, thereby reducing vibration. If dehydration is performed in one washing tub, the method prevents the other washing tub performing no dehydration process from entering the dehydration process.