The method of using infrared radiation can not only reduce costs but also decrease the rate of faults. The ground brush of the vacuum sweeper consists of a son ground brush and a parent ground brush. In accordance with different using environments, the son ground brusher and the parent ground brusher can be separated for different using requirements.The ground brusher end is provided with a light-sensing LED lamp. When the lamp switch on the right side of the ground brush is turned on, for example when the ground brush extends to such dark areas as below the bed, the ground brush will automatically sense the darkness and turn on the LED lamp.