TEMPEST technology has been concerned much more in recent years. Video Displayer Unit, which is one of the most import parts that may result in computer information leakage, offers the interface for man-machine conversation directly and its video electromagnetic radiation contains the displaying information. The interception and recovery system of video electromagnetic information leakage of the computer is designed. After the electromagnetic leakage is intercepted, the method to recover the word image is presented using the reconstruction techniques such as synchronization, related filtering, phase lock on etc. This means that the original useful information can be reconstructed by the electromagnetic leakage under certain conditions, and this will menace information security. It is one of the most important factors that should be concerned in information security and electronic antagonism fields.
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