Functional near-infrared spectroscopy is a method developed for dynamic detection of brain function in recent years.It can well reflect the changes of brain aerobic metabolism during cognitive activities in depressed populations,providing new ideas for subthreshold depression research.Based on the literature review and the theory of TCM emotions,this study discussed the response mechanism of the emotional stimulation of TCM to subthreshold depression based on the functional near-infrared spectroscopy on the basis of previous studies,so as to provide theoretical and practical feasibility for the later research.