Objective: To analyze the composition rules of prescriptions in treating recurrent oral ulcer in the literature in Chinese journal full-text database (CNKI) using the Traditional Chinese Medicine Inheritance Support System

and provide reference for further research and development of new traditional Chinese medicines(TCM) in treating recurrent oral ulcer. Method: The Traditional Chinese Medicine Inheritance Platform Software V2. 5 was used to build a prescription database of Chinese medicines in treating recurrent oral ulcer. The software integration data mining method was used to distribute prescriptions according to four natures of drugs

five flavours and meridians in the database and achieve frequency statistics

syndrome distribution

prescription rules and new prescription analysis. Result: Analysis on 158 prescriptions in treating recurrent oral ulcer determined the frequencies of herbs

commonly used herb pairs and combinations in prescriptions

and summarized 11 new prescriptions. Conclusion: This study indicated that the prescriptions in treating recurrent oral ulcer in Chinese journal full-text database are mostly those for heat-clearing and detoxifying

heart-relieving and blood cooling

spleen and kidney warming

soothing liver-Qi stagnation

with a cold or warm property

bitter and sweet in taste. TCM syndromes can be divided into accumulated heat in spleen and stomach

hyperactivity of fire due to Yin deficiency

flaming up of heart fire

deficiency of both Qi and blood

Yang deficiency of spleen and kidney

syndrome of Pi-deficiency with damp harassment

depressing internal heat in liver

and stagnation of Qi and blood stasis

etc.