Abstract:Recurrent oral ulcer is a kind of unexplained and intractable disease. Using traditional Chinese medicine to treat recurrent mouth ulcers has advantages of significant effect and difficult recurrence. Feng Jianchun considers that the pathogenesis is closely related to dampness-heat, phlegm, blood stasis and damp-toxin. Examining the meridian linking of the ulcers is to distinguish the zang-fu organs. Looking the shapes of the ulcers is to diagnose the disease nature. Differentiating syndrome is to distinguish cold, hot, deficiency, excess. In urgent conditions, treat the branch. While in moderate conditions, treat the root. It is very important to regulate qi activity of spleen and stomach and protect healthy qi. The therapeutic effects are remarkable to treat stubborn recurrent mouth ulcers by promoting blood circulation to dredge collaterals when persistent illness entering collaterals. Feng Jianchun attaches great importance to the holistic therapy and treat disease before it arises.