Abstract: The close cooperation between government and enterprise is crucial to ensure the timely supply and rapid delivery of emergency supplies.In order to ensure the effective supply of spot supplies after the disaster and improve the government's ability to guarantee emergency supplies, this paper studies emergency supplies procurement with second order opportunities, and constructs a two-stage government-enterprise cooperation model before and after the emergencies. Before the disaster, the government and enterprises use decision-making games to determine the optimal government prepayment ratio and enterprise reserves; after the disaster, considering that the commercial inventory of agreement enterprise is used as an emergency supplement to the demand beyond the initial reserve, two parties determine the optimal government pre-subsidy coefficient and the enterprise's commercial inventory ratio during the second order process. In addition, numerical examples and sensitivity analysis are used to verify the effectiveness of the model. Furthermore,this paper also explores the advantages of emergency supplies procurement with second order, and analyzes the impact of different system parameters on the decision-making of both parties.Finally,some practical management implications for government procurement and enterprise reserve are proposed.

Key words: emergency material supply, emergency supplies pre-positioning, the second order, commercial inventory