With the improvement of people's understanding of disaster relief, emergency logistics has become an important guarantee to improve the efficiency of relief and safeguard the safety of people's lives and property in recent years. In this paper, the research theories, methods and models of emergency logistics are classified and sorted out, and different problems such as Location Allocation Problem, Vehicle Routing Problem, Location-Routing Problem are classified and discussed. Under the condition that most of the existing researches mainly focus on response cost and response time, this paper argues that the primary purpose of emergency logistics should be to reduce the loss of people's lives and property. Based on this, an extension study on emergency logistics is proposed to provide ideas for further research in related fields. Keywords-emergency logisticst; disaster relief; methods and models3rd

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Big data is a powerful tool which can modernize governance systems and improve governance for current public governance. Based on that, this paper discussed the research on situation of enterprise risk identification and early warning system under the background of big data. At first, the paper integrated the definitions of risk and enterprise risk management by domestic and foreign experts. Secondly, the author put forward that the development of risk identification and intelligent early warning is inevitable in the era of big data, and gave suggestions for improving the early warning system. Finally, the paper described the prospects of risk identification and early warning systems in the context of big data in the future. In summary, it is important to establish a closed-loop management chain of data security protection.

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