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To monitor and control industrial machinery and processes, industrial control systems play an important role in daily life. Resilient control is a new topic of control technologies which studies how to maintain acceptable level of operation or service in face of undesirable incidents. This emerging technology, applied to industrial control systems, can provide a certain degree of protection for critical infrastructure, such as electric power generation, transmission and distribution, oil and gas production, water treatment. This paper proposes a 3-layer system model and resilience curve, discusses the concept and presents definition, properties and some insights of resilient industrial control systems. The metrics to estimate resilience quantitatively is disclosed. The general approaches to build, operate and improve a resilience industrial control system are proposed as well. Cyber attack resilient power grid automation system is discussed to illustrate the proposed approaches.