Method and system for preventing mobile device screen display from being peeped

The invention provides a method and a system for preventing mobile device screen display from being peeped. The method includes: prompting a user to select a peep-preventing mode, adjusting one or more of background luminance, background color, character contrast ratio or refresh frequency of mobile device display according to selection of the user to enable the display to be weakened, and adjusting one or more of the background luminance, the background color, the character contrast ratio or the refresh frequency of the display according to ambient luminance so that the weakened degree adapts to the ambient luminance. The method and the system have the advantage that mobile device display which is weakened in crowded public environments prevents personal information from being peeped.