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With the development of computer networks, the spread of malicious network activities poses great risks to the operational integrity of many organizations and imposes heavy economic burdens on life and health. Therefore, risk assessment is very important in network security management and analysis. Network security situation analysis not only can describe the current state but also project the next behavior of the network. Alerts coming from IDS, Firewall, and other security tools are currently growing at a rapid pace. Large organizations are having trouble keeping on top of the current state of their networks. In this paper, we described cyberspace situational awareness from formal and visual methods. Next, to make security administrator comprehend security situation and project the next behaviors of the whole network, we present using parallel axes view to give expression clearly of security events correlations. At last, we concluded that visualization is an important research of risk evaluation and situation analysis of network.