Abstract: The present invention discloses a multi-power control system for scanners. The method of the present invention has a mode of warm up time, which is controlled by a software that is embeded in a computer. Users can choose a mode of warm up time to control the warm up duration when a cathode ray tube needs. After scanning, users can determine whether the scanner is to operate or in standby status. When the user chooses the latter, the luminosity of the cathode ray tube is according to the user's pre-set. This multi-power control system not only can reduce the warm up time but also can be in harmony with the concept of enviromental protection.