In view of the problem of the current e-government system information being threatened in the network, this paper solves it with the information security technology and e-government security system. Firstly, it describes the encryption technology, intrusion detection technology, firewall technology, digital signature technology, etc; secondly, it designs the e-government security system framework and analyzes the security system supporting technology ; finally, it discusses on the realization of information security from three aspects: physical layer, network layer and application layer. This paper has a certain positive significance for e-government maintenance personnel.