Objective: By analyzing the used law of different nature herbs in 1 307 prescriptions

research the compatibility law of chinese herbs with neutral-nature. Method: Screened 1 307 prescriptions from two books

science of prescription

and Pharmacopoeia of the People's Republic of China

judged the nature of herbs according to Pharmacopoeia

established the data base with the obtained data named Data analysis system of Chinese heabs and prescription. Research the compatibility law of chinese herbs with neutral-nature with the data base

defined the common heabs whose used frequency was upper limit 10% actored as sovereign

minister

assistant and courier

and defined the major herbs whose used frequency was upper limit 25%. Result: It is the used frequencies of heabs with different nature used as different actors in 1 307 prescriptions

that cold 42%

neutral 15%

hot 43% separately used as sovereign heab

cold 40%

neutral 17%

hot 43% separately used as minister heab

cold 37%

neutral 20%

hot 43% separately used as assistant heab

and cold 17%

neutral 66%

hot 17% separately used as assistant courier heab. Screened the common and major heabs with nentral nature used as sovereign

minister

assistant and courier. Conclusion: The feature of heab with neutral nature in compatibility. is less used as sovereign

minister heabs

more used as assistant and courier heabs. The screened commoned and majored heabs with neutral nature will provide a useful reference.