The purpose of this study is to discuss the issue of spy network with focus on global covert surveillance, and to examine the secret security agreement dominated by the United States to conduct global surveillance. The agreement was signed by the United States (NSA), United Kingdom (GCHQ), Canada (CSEC/CSE), Australia (ASD), and New Zealand (GCSB), also known as the“five eyes". They form the so called“Echelon"intelligence gathering channel which includes:“Prism",“Mainway",“Marina",“Nucleon", accompanied by the British“Tempora"plan and spy networks. In addition to criticize the controversial behavior of using spy monitor satellites to intercept electronic transmission and communications, this article is more interested in EU and other countries in the world to examine the internationalinteraction on this issue. It has found that the core of global security strategy is always focused on national interests. Accordingly, the hegemonic states will continue to monopoly the spy network. We must be committed to maintain the confidentiality of electronic information in order to prevent various kinds of cyber invasions from China. Therefore, the information security industry needs to be included in the national defense strategy and the C4ISK systems needs to be integrated in order to beef up the capabilities to counter enemy's cyber attacks.