Abstract: COVID-19 began spreading in Wuhan， China in December 2019. The main clinical manifestation was pyrexia， lassitude and tussiculation. Professor Wang Canhui discussed it from its name， etiology， pathogenesis， syndrome differentiation， therapeutic principle and methods in traditional Chinese medicine. It is held that COVID-19 was an epidemic disease characterized by stagnance， scrofula and cold. The etiology and pathogenesis was pestilential qi attack accompanied by cold-dampness， combined with latent dryness. Syndrome differentiation of qi-nutrient-blood， triple energizer and zang-fu should be applied. The therapeutic principle should be calming and unblocking so as to truncating and reversing as well as relieving Moyuan. As for therapeutic methods， the priority was to clear lung and dissolve toxin with the key to diffuse the lung and relieve cough. These methods can also be applied in accordance with clinical manifestations: Dispelling wind to relive sore throat， removing dampness to drain turbidity， dissolving stasis to unblock the colleterals and reinforcing healthy qi to consolidate the constitution.