Abstract: The theory of preventative treatment， the core ideology in traditional Chinese medicine， can be applied into every prevention stage of COVID-19. In terms of three prevention stages of COVID-19， the study found that aromatic medicines can be prescribed to dispel filth before its onset， resulting in protecting the lung and kidney as well as nourishing healthy qi. As for the stage of controlling the development of disease， we should pay much attention to the characteristics of dampness toxin and avoid transforming into heat or stasis， or even worse into block or collapse pattern. When it comes to the stage of preventing recurrence， the principle of strengthening earth to generate metal and recovering both the body and mind should be followed. In addition， balanced diet， life-cultivation qi gong， music， and massage on acupoints can be applied to truncate the risk of recurrence and promote the rehabilitation， with a view to providing thoughts for the prevention of COVID-19.