Acting as the key promoter of information revolution, information and communications technologies influence every corner in economic activities and social structure increasingly due to their rapidly developing. The improvement of technology augment the velocity, volume and functions of information storage and execution, it declines the cost of propaganda too. More importantly, the technological essence includes the transformations of simulation technique into digital technique, semiconductor into microprocessor, cable and fix telecommunications into wireless and mobile telecommunications, exclusive system into open system, and relatively independent media like audio, data, letters and pictures into interacted multi-media.