Chinese medicine classifies cough into cold cough and hot cough. The tongue of cold cough is mainly characterized by white and thick moss, light and fat tongue, tooth marks, and no red signs visible, as well as symptoms with vicious cold, fear of cold, non-dry mouth, loose stools, clear and long urine, and even vague pain in the stomach and epigastrium, and the patient does not sweat easily. The cold cough tongue can guide the detailed identification of TCM practitioners, who generally give drugs to dispel wind and cold, promote the lung and stop coughing. If there are combined symptoms of deficiency cold in the spleen and stomach, treatment to warm the middle and strengthen the spleen and stop coughing and resolve phlegm should also be given, because TCM believes that the spleen is the source of phlegm production and the lung is the storage vessel for phlegm, so cultivating the earth can produce gold and strengthening the spleen can resolve phlegm. The tongue of cold cough should be repeatedly deliberated under natural light, so as not to misdiagnose it as other evidence of cough and avoid bringing certain effects to the treatment.