Objective: To explore the medication rules of state medical master YAN Zheng-hua's prescriptions with Taxilli Herba. Method: Prof. YAN Zheng-hua's prescriptions containing Taxilli Herba were collected to build a database based on Traditional Chinese Medicine Inheritance Support System (TCMISS). Then the data were mainly analyzed by Apriori algorithm in TCMISS to acquire the frequency of single medicine

the frequency of drug combinations

the association rules and core drug combinations. Result: The prescriptions containing Taxilli Herba were commonly used to treat vertigo

arthromyodynia syndrome

lumbago and other syndromes. The frequently used drugs were Paeoniae Radix Rubra

Achyranthis Bidentatae Radix

Paeoniae Radix Alba

Salviae Miltiorrhizae Radix et Rhizoma

Dipsaci Radix

and so on. The frequently used drug combinations were 'Paeoniae Radix Rubra

Taxilli Herba'

'Achyranthis Bidentatae Radix

Taxilli Herba'

and 'Paeoniae Radix Alba

Taxilli Herba'. The drug association rules with a confidence of more than 0.9 included 'Achyranthis Bidentatae Radix-> Taxilli Herba'

'Poria-> Taxilli Herba'

'Mori Ramulus-> Taxilli Herba'

and 'Fired Ziziphi Spinosae Semen-> Taxilli Herba'

and so on. Conclusion: Prof. YAN Zheng-hua's prescriptions containing Taxilli Herba mostly have the effects of nourishing liver and kidney

promoting blood circulation to remove blood stasis and relieve pain

expelling evil-wind

removing dampness

with concentrated medication and clear prescription principles.