Disclosed are a washing machine and a control method thereof capable of reincreasing a number of rotations of a motor after maintaining the number of rotations at a predetermined number before excessive vibration of a water tub, braking the motor when the water tub is vibrated at more than a predetermined vibration level, and reincreasing the number of rotations, thereby reducing the excessive vibration of the water tub. The control method includes detecting the number of rotations, determining whether the detected number of rotations has reached a predetermined number, controlling the motor such that the number of rotations is maintained at the predetermined number of rotations when it is determined that the detected number of rotations has reached the predetermined number, counting the time taken to maintain the number of rotations at the predetermined number of rotations, and increasing the number of rotations after a predetermined first time has elapsed.