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A critical infrastructure (CI) consists of those physical and information technology facilities, networks, services and assets which, if disrupted or destroyed, have a serious impact on the health, safety, security or economic well-being of citizens or the effective functioning of governments. Nowadays, the operation controls of these infrastructures have been computerized and have gradually become open systems. The malfunction controls of the information technology (IT) have been one of the focuses in the researches of information security management in industrial control system (ICS). In this paper we discuss the IT malfunction of ICS security incidents which occurred in Taiwan, and explore the details of the controls for CI.