Objective: To explore the medication rules and clinical experience in treating psoriasis by professor ZHONG Yi-ze. Method: Professor ZHONG Yi-ze's 104 traditional Chinese medicine (TCM) prescriptions for treating psoriasis were collected for building a database. The related software was used to analyze the correlation between these herbs in prescriptions. Result: These charts showed the ranking of single Chinese herbs with frequency ≥10

the ranking of herbal combinations of 2 kinds of herbs with frequency ≥30

the ranking of herbal combinations of 3 kinds of herbs with frequency ≥30

and the single use and combined use of the herbal medicine for nourishing Yin and the herbal medicine for activating blood circulation. Conclusion: The combination of 2 kinds or 3 kinds of herbs are useful for writing prescriptions. Herbs for removing heat evil

cooling blood and removing toxins are used as monarch drug in the prescriptions; the herbs for nourishing Yin

promoting blood circulation and removing blood stasis are used as ministerial drug in the prescriptions; and the rest herbs are selected to use according to the symptoms.