It is impossible to do a master's thesis without a robust test. Robustness test is generally placed at the last part of the paper, and it is also an essential part of every paper. Without the robustness test, the structure of the paper is incomplete. Robustness test examines the robustness of the interpretation ability of evaluation methods and indicators, that is, whether evaluation methods and indicators still maintain a relatively consistent and stable interpretation of evaluation results when some parameters change.