Section 3 focuses on the mechanism behind the formation of the mutually amplified phenomena between hazards. The typical multi-hazard coupling scenarios related to CPI are first identified and classified. Through summarizing, aggregating, organizing, and comparing the knowledge extracted from the existing studies, the coupling hazardformative mechanism of typical multi-hazard scenarios in CIP is made clear. Based on the regional disaster system theory and the extracted knowledge, a comprehensive and inclusive framework is provided.