This chapter delves into the critical role of control systems within the industrial internet, which are essential for managing production equipment, workflow processes, and product quality. It highlights the importance of control security analysis in identifying and addressing potential ICS threats to ensure safe production practices and environmental protection. The chapter provides a comprehensive evaluation of ICS threats, vulnerability assessments, and attack methodologies. It discusses the integration of cyber and physical elements for predeployment testing in ICS simulation environments and outlines strategies for postdeployment attack detection to safeguard the stable operation and critical resources of the industrial production backbone.