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emergency management information system (PSEMIS) in large-scale hydroelectric project. This paper analyses the reviews and China three gorges project corporation work safety and emergency management status and business needs, proposes the overall framework of the system design. The basis of the work safety management system and emergency management system is the safety risk control and hazards classification standards. The paper discusses the safety risk control and hazards classification standards; analyses the main function modules of the work safety and emergency management application software systems respectively; and discusses the hazards risk assessment and identification standards, business model design, systems integration, digital contingency plans and other key technical problems.