This paper introduces the experience of professor Wu RuiMin in the treatment of subacute thyroiditis. Professor Wu thinks the disease belongs to TCM(traditional Chinese medicine) syndrome “gall swell” or “fever”, induced by the wind evil and flu virus. In the acute phase, exuberance heat stagnated in liver and stomach, and internal and external pathogens trigger the disorder. In remission progress, due to deficiency of spleen yang, qi fails to promote water. As a result, qi and phlegm stagnate and further caused stagnation. The treatment should be processed from three stages, dispelling wind and dissipating pathogen with regulating liver and clearing stomach at first, then warm spleen yang to eliminate dampness, and last to regulate qi and remove phlegm and stagnation or activating blood movement. Professor Wu regards that such a disease is easily to be mis-diagnosed, and thus should be differentiated with both western and Chinese medicine. In treatment, Chinese medicine should be taken as priority to deal with different syndromes. This has received favorable results.