National security policies are defined as ¡§Those effective procedures or actions taken by the government to guard the nation whenever the nation encounters the crises endangering national security¡¨. After the end of the curfew in 1987, the authoritarian form of government turned into a democratic one. In the transformation process from 1988 to 2008, the ¡§silent revolution¡¨ had been achieved through the peaceful exchange of the ruling parties, which had increased the democratic development of Taiwan and renewed each social status. Nevertheless, diversified opinions and disagreements resulted from such a successful revolution. The transition of political party in 2000 is a turning point. Different ruling parties hold different claims and implement different national policies. Moreover, the nation security was influenced by three crucial issues¡Ftherefore, the formulation and implementation of national security policies are worthy of deeper exploration. This research structure followed the politic systematical theory and investigated our national security policies to achieve the following two purposes¡G (a) the investigation of the crucial period after the end of curfew, the formulation of the national security policies under the politic systematical theory and different ruling concepts by different ruling parties, and (b) the analysis and comparison of the national secure policies, in terms of the politic systematical theory, between different ruling parties¡¦ viewpoints in the operation of the democratic system.