• This paper uses 289 local debt risks from 2009 to 2016 as samples to empirically test the impact of inspection supervision on local debt risks for the first time. Compared with previous literature, the main contributions of this paper are as follows: Firstly, this paper studies the impact of inspection supervision on local government debt risk for the first time. The current research on inspection system is mainly based on normative theory, and there is no empirical test on the impact of inspection on local debt risk. This paper takes inspection supervision as a quasi-natural experiment, studies its importance in reducing local debt risk, and expands the research horizon of inspection supervision. Secondly, the research on local debt risk has been enriched and refined. In the early literature, due to the problem of data availability, provincial panel data was mainly used to study local debt risk. Compared with provincial panel data, which is more affected by political factors, municipal performance assessment pays more attention to economic performance assessment, so the use of municipal panel research is more suitable for local debt risk. This paper extends the study from the provincial panel to the prefecture-level city panel, providing further micro evidence for the study of local debt risk. Thirdly, this paper further studies and finds that in the samples with poor regional financial ecological environment and large soft budget constraints, inspection supervision has a more significant effect on reducing local government debt risks, indicating that inspection supervision is an important governance mechanism arrangement to make up for weak market governance and low government governance level, which also provides policy implications for inspection supervision. It is conducive to the modernization of national governance capacity and system. This paper employs a difference-in-differences (DID) model to analyze data from 289 Chinese prefecture-level cities from 2009 to 2016 and comes to the following conclusion: patrol supervision can reduce the risk of local government debt. After conducting a series of robustness tests, including propensity score matching (PSM) tests, transformation study design, and replacement of explained variables, this conclusion remains robust. Further investigation reveals that the effectiveness of inspection and supervision in reducing local government debt risk is more pronounced in regions with a poorer financial ecological environment and a greater soft budget constraint, indicating a substitute function. By examining the impact of patrol supervision on local government debt risk, this paper provides valuable insights for preventing and resolving major risks and offers up recommendations for future efforts in this domain. [ABSTRACT FROM AUTHOR]