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The article educes three thermal comfort indexes correspond to three different types of underground space. In addition, it revises and classifies the indexes by thermal comfort test data. At the same time, it takes dissatisfaction rate of questionnaire as the gist of subjective evaluation and thermal comfort index value as the gist of objective evaluation to assess the thermal comfort of underground space. On this basis, take the thermal comfort test data measured in underground malls for example to assess the thermal comfort.