Large- scale blackouts in cities affects a wide range of areas, and it is difficult for a single industry or department to deal with it. It is necessary to analyze the power failure scenario through scientific methods and build an emergency linkage mechanism covering multiple subjects. A scenario analysis model is constructed to describe power outage events from three dimensions:risk evolution, event classification and logical level. Based on the theory of urban system and the principle of scenario construction,through empirical analysis and logical deduction, key scenario chains such as power failure, communication interruption, oil supply interruption, water supply interruption and traffic paralysis are constructed, and the needs and deficiencies of emergency linkage are analyzed combined with cases. Based on the perspective of “scenario-response”, and taking electric power emergency repair and restoration as the main body, the emergency linkage mechanism covering the power grid enterprises, between the power plant and the grid, between the government and enterprises and between people’s livelihood industries is constructed, and the specific and feasible comprehensive linkage mechanism and strategy for higher effects on large-scale power outage events is proposed.