Abstract:    Under the strategic vision of the overall national security concept, in order to promote the rapid embedding of scientific and technological research and development forces in the field of major public crisis response,it has become an important subject in the process of modernization of national security and innovation governance to explore the construction of a well-structured and orderly national emergency scientific research mechanism and improve the ability of systematic against major risk challenges.
    Therefore, based on the empirical facts of emergency scientific research disposal since China′ s reform and opening up, it has been continuously strengthened from segmentation to multi-level, multi-agent and cross-departmental coordination, from a single "administrative command line"to a parallel integration of "administrative command line" and "academic command line". This paper systematically analyzes the practical evolution logic from the "single disaster ", "short-term" and "single case-based"emergency scientific research disposal mechanism to the construction of an institutionalized emergency disposal framework that points to multiple disasters, multi-scale and "integration of emergency standing force and professional force", and to clarify the internal driving mechanism of change from the two aspects of technical support and institutional guarantee.
   On this basis, starting from the connotation analysis and operation characteristics (mainly contain centralized organizational operation, applied scientific research orientation and modular functional structure) definition of the national emergency scientific research mechanism, based on the two-dimensional governance analytical vision of the fusion of national security governance and innovation governance, persisting in system thinking and bottom line-thinking and focusing on the judgment of its theoretical construction direction, this paper tentatively puts forward three levels of logical transformation views: from the "abnormal response" logic characterized by short-term, temporary and passive response to the "strategic existence" logic characterized by active response and long-term orientation; from the "exclusive competition" logic with the maximization of market interests as the innovation appeal to the "diversified cooperative innovation "logic based on the public value creation orientation; from the "closed decision-making"dominated by the internal consultation model to the "open decision-making" based on the high-level cooperative decision-making model.
    At the same time, this paper combines the unique realistic scenarios of China′ s emergency scientific research management, starting from the above theoretical logics, and around the three key practical policy issues in the construction of the national emergency scientific research mechanism, and puts forward corresponding policy suggestions for specific practical approaches such as starting the construction of emergency scientific research scenarios for major emergencies, establishing an emergency scientific research response system with active triggering mechanism as the core, and deepening the reform of the command mechanism of the national emergency scientific research center, so as to provide reference for improving the emergency scientific research management system with Chinese characteristics in the new era.
    In general, based on the exploratory analysis of the concept, connotation and construction ideas of the national emergency scientific research mechanism, this paper preliminarily answers the direction selection and policy path of the construction of the national emergency scientific research mechanism in the context of the modernization of major power governance in the new era, which makes up for the existing literature gap, helps to expand and enrich theoretical cross-study in the field of emergency management, innovative governance and security governance, and provides a useful reference for the deepening research and related policy formulation of subsequent scholars.

Key words: national emergency scientific research mechanism, two-dimensional governance, Covid-19 epidemic