Along with the rapid development of network and computer technology, more forms of evidence e-merge than before. Traditional exclusionary rule of unlawfully obtained evidence includes four fundamental theories of falseness exclusion, unlawful action control, human rights protection and procedure justice. But in the context in-formation society the four theories seem a bit powerless. The paper tries to disenchant these theories and proposes the new theory--cyberspace liberty protection in view of the network space. It also regards exclusionary rule of un-lawfully obtained evidence in the virtua...