To observe the clinical effect of traditional Chinese medicine on recurrent oral ulcer.

68 patients with recurrent oral ulcer were treated in our hospital, 68 outpatients were randomly divided into two groups: treatment group and control group. The control group received outpatient symptomatic treatment and uninterrupted given cydiodin, vitamin C and compound vitamin B tablets for oral treatment; treatment group were given outpatient treatment and traditional Chinese medicine ointment conditioning based on syndrome differentiation. To observe and compare clinical efficacy of the treatment group.

The total effective rate of the treatment group was 86.11%, which was significantly better than that of the control group 28.13%, the difference was statistically significant（P＜0.01）.

Traditional Chinese medicine ointment in the treatment of recurrent oral ulcer can significantly reduce recurrence rate, improve the immune function of the body, clinical efficacy, the quality of life of patients.