Recurrent oral ulcer is a common disease that occurs in the oral mucosa.Western medicine believes that its incidence is related to many factors,while traditional Chinese medicine believes that it is mainly related to the "fire"evil.The cause is mostly divided into actual fire and virtual fire.Its main pathogenesis is the spleen and stomach rise and fall dysfunction,qi disorder,yin and yang are out of balance,the disease is mainly in the mouth,spleen and stomach,involving the heart,liver and kidney.There is currently no specific treatment plan for treatment.Western medicine focuses on symptomatic and etiological treatment.However,the treatment effect of single western medicine is not significant and the disease is easy to recur.The individualized treatment plan of traditional Chinese medicine has played a great advantage,and the treatment plan of integrated traditional Chinese and western medicine has been in recent years and highly respected.In the clinic,Professor YANG Xiao-jun uses the combination of prescription and western medicine to treat patients with recurrent oral ulcers through specific syndrome differentiation and treatment.The author summarizes professor YANG Xiaojun′s experience in treating recurrent oral ulcers and shares a specific medical record with other doctors.