| The application of policy mix in public crisis management is an important topic in magnitude outburst public health incident.In Covid-19 the Chinese government developed different response policies at different stages,resulting in outstanding public governance effects.Local governments chose different policy mixes in their policy formulation and produced different governance effects.What are the structural relationships within these policies,what are their external performance characteristics,how do the different types of policies act synergistically,and how do policy combinations correlate with governance effects? These are the questions that this paper seeks to explore.In this paper,we collect data on policies related to epidemic management at the city government level from the perspective of policy mix,and categorize them based on the analysis method of Grounded Theory to extract two key characteristics: ‘policy visibility’ and ‘policy ubiquity’.The greater the centrality of the weighted degree of the city government,the higher the policy visibility;the greater the sum of the centrality of policy nodes associated with the city,the higher the policy ubiquity,and then through a series of iterations,the two are fused to generate the ‘policy mix characteristic index’.The ERGM model is constructed as the dependent variable to investigate the influence of network structure on the policy mix,and the panel data model is constructed as the independent variable to examine the causal relationship between the application of differentiated policy mixes and governance effects of city governments.The results of the study found that(1)the coordination and reinforcement between policy visibility and ubiquity lead to different policy mix characteristics.(2)The more politically and economically concentrated a city government is,the stronger its policy mix characteristics are.(3)There is a Matthew and homogeneity effect in the policy mix network,which tends to form a 2-degree structure and a closed tertiary structure.(4)The policy mix of city governments in epidemic management has a significant positive effect on policy performance,and the effect on epidemic control shows a U-shaped distribution.This paper constructs an analytical framework for the policy effectiveness of magnitude outburst public health incident from a policy mix perspective,clarifies the intrinsic association between policy mix and policy effectiveness,and provides a general theoretical tool for policy mix analysis.In contrast to previous studies of single government networks,the dual-mode network theory is applied to policy mixes,extending the existing policy mix studies from qualitative to quantitative analysis,and the policy mix characteristics index constructed in this way can be used as a general analytical tool for other crisis governance analyses with complexity,systemic and dynamic characteristics. |