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With the development of network technology, network environments become more complex, a simple firewall technology revealed obvious deficiencies and weaknesses, some attacks can bypass the firewall, directly onto the internal network, making network security threats, from computer safety point of view, there is no absolute security in the world of computer systems, Linux operating system as well. With the Linux operating system use and popularity, the current attacks against it more and more security incidents are also increasing. Linux operating system through the introduction of intrusion detection system to the system protection, intrusion detection technology is an active protection from hacker attacks, network resources security technology. Intrusion Detection System (IDS-Intrusion Detection System) can make up for lack of a firewall Its task is to identify for the computer systems and network systems, or more broadly the illegal attacks on information systems, including detection of malicious attacks outside intruders or legitimate users of test and internal permissions beyond the illegal action. It with detection and control (with other systems such as firewalls) a combination of technology, plays a proactive role in providing real-time network security intrusion detection and take necessary protective measures. In the Linux platform is based on the Snort and build a based network intrusion detection system to help the network to detect network intrusions, the effective protection of network security