The coughing yellow phlegm at the beginning and now white phlegm, from the analysis of TCM theory, may be caused by coughing yellow phlegm, sore throat, dry mouth, bitter mouth and other symptoms caused by wind-heat cold at the beginning, after taking heat-clearing and detoxifying drugs such as Pu Di Lan Oral Liquid, Qing Kai Ling Oral Liquid, Anti-Viral Oral Liquid, it may lead to deficiency of cold in the spleen and stomach, thus turning into white phlegm at a later stage. At this time, the treatment principle should be changed to strengthening the spleen and dispelling dampness, warming the lung and dispersing cold, which can be taken orally with apricot sophora cough syrup and wind-cold cough syrup.